Guide
Oxytocin and Carbetocin After Childbirth: The Peptides That Prevent Bleeding
Oxytocin and carbetocin after childbirth, checked October 5, 2026: how they prevent bleeding, the CHAMPION trial, heat-stable carbetocin, and what the reviews say.
Last updated: October 5, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Teriparatide and Abaloparatide: The Peptides That Build Bone
Teriparatide and abaloparatide, checked October 5, 2026: fracture trials, how they compare, the removed osteosarcoma warning, and bone claims for research peptides.
Last updated: October 5, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
GnRH Agonists, Antagonists and hCG: The Peptides That Run IVF
Peptides in IVF, checked October 5, 2026: how GnRH agonists, antagonists, hCG and kisspeptin are used, what the Cochrane reviews found, and the OHSS trade-off.
Last updated: October 5, 2026 · Reviewed by Grey Peptides Editorial Board
Science
Peptide YY vs Neuropeptide Y: Appetite's Opposite Signals
Peptide YY vs neuropeptide Y, checked October 4, 2026: how two related peptides drive appetite in opposite directions, and what drug trials on each found.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptides for Anxiety: Selank, Semax and the Evidence Gap
Peptides for anxiety, checked October 4, 2026: what selank and semax studies found, why they fall short of Western trial standards, and what treatments work.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptides for Sleep: DSIP, Epitalon and What Actually Has Data
Peptides for sleep, checked October 4, 2026: what DSIP and epitalon trials found, how FDA's advisers voted on them, and the sleep treatments with real evidence.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
What the PCAC Vote Means for Clinics and Compounding Pharmacies
What the July 2026 PCAC vote means for clinics and compounding pharmacies, checked October 4, 2026: what is allowed now, what listing would change, and how to prepare.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
State Pharmacy Boards and Peptides: Where States Diverge From the FDA
Peptide laws by state, checked October 4, 2026: verified actions by Ohio, Louisiana, Mississippi and Alabama boards and lawmakers, and how they relate to federal rules.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
How a Substance Gets on the 503A List: The Nomination Process, Step by Step
How a substance gets on FDA's 503A bulks list, checked October 4, 2026: nomination, the four criteria, the advisory committee and rulemaking, with the 2026 cycle.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
When Customs Seizes a Peptide Package: What the Rules Say
Peptide packages seized by customs, checked October 4, 2026: FDA's personal importation policy, Notices of FDA Action, how to respond, and administrative destruction.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptides on Amazon, Temu and TikTok Shop: What Those Listings Actually Are
Peptide listings on Amazon, Temu and TikTok Shop, checked October 4, 2026: what they are, why BPC-157 is not a lawful supplement, and what testing has found.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptides vs Collagen vs Amino Acids vs Protein: Clearing Up the Confusion
Peptides vs collagen vs amino acids vs protein, checked October 4, 2026: definitions, what digestion does to each, and the evidence on collagen peptide supplements.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
What a Legitimate Peptide Prescription Looks Like, and the Red Flags
What a legitimate peptide prescription looks like, checked October 4, 2026: the assessment, the prescriber, the pharmacy, the label, telehealth rules and the red flags.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptide Raves and Group Buys: How Self-Injection Went Social
Peptide raves and group buys, checked October 4, 2026: how self-injection became social, what lab tests of gray-market vials found, and the harm-reduction gaps.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptide Radiopharmaceuticals: How Lutathera and Pluvicto Find Cancer
Lutathera and Pluvicto, checked October 4, 2026: how radioligand therapy and theranostics work, the trial results, the current US labels and doses, and the risks.
Last updated: October 4, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Venom to Medicine: The Peptide Drugs That Began as Toxins
Venom-derived peptide drugs, checked October 3, 2026: exenatide from the Gila monster, ziconotide from a cone snail, eptifibatide from a rattlesnake, bivalirudin from leech saliva and captopril's viper origin.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Antimicrobial Peptides: The Antibiotic Pipeline's Long Shot
Antimicrobial peptides as antibiotics, checked October 3, 2026: daptomycin and the polymyxins, the failed phase 3 trials of iseganan, pexiganan, omiganan and LL-37, and why they fail.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptide Cycling: Is 'On/Off' Science or Folklore?
Peptide cycling, checked October 3, 2026: what receptor desensitisation studies show for GHRH analogues, ghrelin-receptor secretagogues and GnRH agonists, and why approved peptides are dosed continuously.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Pre-Filling Syringes: Stability Data and Contamination Risk
Pre-filling syringes with peptides, checked October 3, 2026: insulin sterility studies, hidden contamination in syringe hubs, silicone oil and aggregation, leachables and why insulin data don't transfer.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
What Happens If You Inject a Degraded Peptide? Aggregation and Immunogenicity
Degraded peptides, checked October 3, 2026: how heat and light break peptides down, why aggregates provoke antibodies, what happened with epoetin and insulin, and what storage rules exist.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
How Many Peptides at Once? The Case Against Mega-Stacks
The case against peptide mega-stacks, checked October 3, 2026: how interaction pairs multiply, why side effects become impossible to attribute, overlapping effects, quality risks, and the Stack Analyzer.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Women and GH Secretagogues: Why Men's Data Don't Transfer
Women and GH secretagogues, checked October 3, 2026: sex differences in growth hormone release, how oral estrogen and the pill change GH action, and which secretagogue studies included women.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptide Skincare After Microneedling and Lasers: What's Studied, What's Risky
Peptide skincare after microneedling and lasers, checked October 3, 2026: the small trials of GHK-Cu and peptide serums, granuloma and infection risks, and what to ask before applying anything.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptides for Acne and Rosacea: From LL-37 to Omiganan
Peptides for acne and rosacea, checked October 3, 2026: LL-37's role in rosacea, omiganan's two phase 3 trials, dermcidin, azelaic acid's effect on cathelicidin, and peptide skincare claims.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Thymosin Alpha-1: Approved Abroad, Gray Here, and the Immune Evidence
Thymosin alpha-1 (Zadaxin), checked October 3, 2026: where it is approved, the hepatitis, sepsis and COVID-19 trials, FDA's 2024 PCAC vote and safety concerns, and how it differs from TB-500.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
LL-37: The Human Antimicrobial Peptide Up for FDA Review
LL-37, checked October 3, 2026: what the human antimicrobial peptide does, the leg-ulcer and foot-ulcer trials, FDA's safety concerns, and the PCAC review due by February 2027.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Carnosine: The Dipeptide in Your Muscles, and the Supplement Evidence
Carnosine, checked October 3, 2026: what the muscle dipeptide does, why beta-alanine raises it better than carnosine pills, the performance meta-analyses, and the blood-sugar and anti-glycation evidence.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Rusfertide and the Hepcidin Mimetics: A Peptide for Polycythemia Vera
Rusfertide (Mimrylo), checked October 3, 2026: FDA approval in August 2026, how hepcidin mimetics restrict iron, VERIFY phase 3 results, platelet and injection-site warnings, and open questions.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Setmelanotide: The Peptide for Genetic Obesity and How MC4R Works
Setmelanotide (Imcivree), checked October 3, 2026: how the MC4R hunger pathway works, who the label covers, trial results, skin darkening and other warnings, and the link to melanotan peptides.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
VIP and 'MCAS Stacks': What's Studied (Aviptadil) and What's Improvised
VIP and MCAS stacks, checked October 3, 2026: aviptadil's COVID-19 trials, what VIP does to mast cells, migraine provocation, the lack of MCAS trials, and status.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Larazotide: The Celiac Peptide That Almost Made It
Larazotide, checked October 3, 2026: the celiac trials, the phase 2 dose puzzle, why phase 3 stopped in 2022, the zonulin question, and lessons for gut peptides sold online.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
GLP-1s in Type 1 Diabetes: The First Expert Recommendations
GLP-1 drugs in type 1 diabetes, checked October 3, 2026: the first expert consensus, the ADJUNCT and ADJUST-T1D trials, weight and glucose effects, hypoglycaemia and ketosis risks, and what labels say.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
How to Talk to Your Doctor About Peptides (Questions and a Script)
How to talk to your doctor about peptides, checked October 3, 2026: why disclosure matters, what to bring, what doctors worry about, questions to ask, and a simple script.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
How Peptide Drugs Are Made: Synthesis, Purity and Why '99%' Isn't the Whole Story
How peptide drugs are made, checked October 3, 2026: solid-phase synthesis, deletion and truncation impurities, TFA salts, what HPLC purity measures and misses, and how regulators set limits.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Half-Life and Dosing Frequency: Why Some Peptides Are Daily and Others Weekly
Peptide half-lives, checked October 3, 2026: label figures for semaglutide, tirzepatide, liraglutide, exenatide, tesamorelin and more, why some are weekly, and how long they stay in the body.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Ozempic, Wegovy, Rybelsus and the Wegovy Pill: One Molecule, Four Products
Ozempic, Wegovy, Rybelsus and the Wegovy pill, checked October 3, 2026: what each is approved for, doses and forms from the current labels, why they are not interchangeable, and self-pay prices.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
When 'Retatrutide' Isn't: What Independent Testing Has Found
Retatrutide testing, checked October 3, 2026: what buyer-submitted lab reports show, the Victorian liver-injury alert, Lilly's lawsuits, FDA's position, and why a passing purity test is not a safety check.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Traveling With Peptides: TSA, Customs and Temperature
Traveling with peptides, checked October 3, 2026: TSA rules for injectable medication and syringes, customs expectations for prescriptions, label storage limits for Wegovy and Zepbound, and research peptides.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptides and Blood Sugar: MK-677, IGF-1 and GLP-1 Hypoglycemia Risks
Peptides and blood sugar, checked October 3, 2026: MK-677 and growth hormone raise glucose, IGF-1 can cause severe lows, GLP-1 drugs cause lows mainly with insulin or sulfonylureas, and why stacks are unpredictable.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptide Injection-Site Reactions: Redness, Lumps and When It's an Infection
Peptide injection-site reactions, checked October 3, 2026: normal redness vs lipohypertrophy vs infection, slow mycobacterial infections from contaminated vials, safe-injection basics, and when to get care.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
PT-141 (Vyleesi) for Women: What the RECONNECT Trials Found
PT-141 (Vyleesi, bremelanotide) for women, checked October 3, 2026: the RECONNECT trial results, effect sizes, nausea and blood pressure, the label's limits, and the postmenopausal gap.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Kisspeptin: The Fertility Signal Behind New IVF Research
Kisspeptin and fertility, checked October 3, 2026: what kisspeptin does, the IVF trigger trials in women at high OHSS risk, amenorrhoea and desire studies, analogues, and status.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Eyelash Serums: Myristoyl Pentapeptide-17 vs Bimatoprost
Peptide lash serums vs bimatoprost, checked October 3, 2026: what the Latisse label and trials show, the missing evidence for myristoyl pentapeptide-17, and prostaglandins hidden in cosmetic serums.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Injectable GHK-Cu: The Gap Between Topical Evidence and the Needle
Injectable GHK-Cu, checked October 3, 2026: why topical copper-peptide evidence does not transfer to injection, how much copper a vial contains, animal data, FDA's risk statement and PCAC status.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Oxytocin Nasal Spray: Why the 'Trust Hormone' Studies Didn't Replicate
Oxytocin nasal spray, checked October 3, 2026: the 2005 trust study, the registered replications that failed, the 290-child autism trial, meta-analyses, and oxytocin's approved obstetric use.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Cerebrolysin: The Stroke Drug Sold as a Nootropic
Cerebrolysin evidence, checked October 3, 2026: what the pig-brain peptide mixture is, the Cochrane stroke review, CASTA and CAPTAIN trials, dementia studies, side effects and where it is approved.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Dihexa: Why a 'Stronger-Than-BDNF' Compound Worries Researchers
Dihexa safety, checked October 3, 2026: where the 'stronger than BDNF' claim comes from, the retracted HGF/c-Met papers, why c-Met is a cancer concern, the failed related drug and FDA status.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
NAD+ Injections Are Not Peptides: The Longevity Stack's Category Error
NAD+ is not a peptide, checked October 3, 2026: what NAD+ is, why clinics sell it with peptides, what NR and NMN trials show, the missing evidence for IV NAD+, and FDA and WADA rules.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
Humanin and the SHLPs: Mitochondria-Derived Peptides Explained
Humanin and the SHLPs, checked October 3, 2026: how mitochondrial DNA encodes peptides, the 2016 SHLP discovery, what cell, animal and human biomarker studies show, and why none has been tested as a treatment.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
FOXO4-DRI and Senolytic Peptides: One Mouse Paper and a Market
FOXO4-DRI and senolytic peptides, checked October 3, 2026: the 2017 Cell mouse study, the cell and animal work since, why no human trial exists, and how senolytic drug trials have fared.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
Hexarelin, GHRP-2, GHRP-6: The First-Generation Secretagogues Compared
Hexarelin, GHRP-2 and GHRP-6 compared, checked October 3, 2026: growth hormone release, cortisol, prolactin, hunger, desensitisation, the pralmorelin name, and regulatory and WADA status.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
Follistatin and Myostatin Blockers: From ACE-031's Trial Halt to Apitegromab
Follistatin and myostatin blockers, checked October 3, 2026: ACE-031's halted trial, failed antibodies, bimagrumab with semaglutide, apitegromab's approval, and what black-market follistatin contains.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
IGF-1 LR3, IGF-1 DES and MGF: Growth-Factor Peptides and the Hypoglycemia Problem
IGF-1 LR3, IGF-1 DES and MGF, checked October 3, 2026: what each molecule is, why none has human data, mecasermin's label as the only approved IGF-1, and the hypoglycaemia and cancer questions.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
CJC-1295 With vs Without DAC: The Half-Life Difference That Changes Everything
CJC-1295 with vs without DAC, checked October 3, 2026: albumin binding, the 5.8-to-8.1-day half-life from the 2006 human trials, growth hormone pulsatility, and why Mod GRF 1-29 is a different, unstudied peptide.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
KPV for Gut Inflammation: From α-MSH Fragment to Colitis Models
KPV for gut inflammation, checked October 3, 2026: how the alpha-MSH fragment works, the mouse colitis studies, delivery research, FDA's review finding no human use, and the July 2026 vote.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
BPC-157 for Dogs: Veterinary Use Is Surging With No Veterinary Trials
BPC-157 for dogs, checked October 3, 2026: the only dog study is a pharmacokinetic test in beagles, no veterinary dose exists, and approved arthritis treatments vets use instead.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Can Peptides Help After Surgery? What the Studies and Surgeons Say
Peptides after surgery, checked October 3, 2026: what has been tested around operations and injuries, what has not, the safety questions surgeons raise, and what to tell your team.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptides for Tendon and Ligament Injuries: The Human Evidence, Ranked
Peptides for tendon and ligament injuries, checked October 3, 2026: BPC-157, TB-500, GHK-Cu and collagen peptides ranked by human evidence, and what orthopaedics uses instead.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
GLP-1s and the Brain: Alcohol, Addiction and Dementia in 2026
GLP-1s and the brain, checked October 3, 2026: alcohol use disorder trials, addiction signals, the negative evoke Alzheimer's trials and what the big cohort studies can and cannot show.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
GLP-1 Hair Shedding and 'Ozempic Face': What's the Drug and What's the Weight Loss
GLP-1 hair shedding and 'Ozempic face', checked October 3, 2026: hair-loss rates from the Wegovy and Zepbound labels, telogen effluvium, facial volume loss and what helps.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
GLP-1s Before Surgery: The Aspiration-Risk Guidance, Explained
GLP-1s before surgery, checked October 3, 2026: why aspiration is a concern, how guidance changed from holding to continuing, what the labels say, and questions to ask.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
Enlicitide (Lipfendra): The Oral Macrocyclic Peptide for Cholesterol, Explained
Enlicitide (Lipfendra), checked October 3, 2026: the first oral PCSK9 inhibitor, the macrocyclic peptide chemistry, CORALreef trial results, the label and the outcomes trial still under way.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
Icotrokinra (Icotyde): How a Pill Blocks IL-23 in Psoriasis
Icotrokinra (Icotyde), checked October 3, 2026: the first oral IL-23 receptor-blocking peptide for psoriasis, how it works, the FRONTIER and ICONIC trials, and the label.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Regulatory
The Second PCAC Five: LL-37, GHK-Cu, Dihexa, Melanotan II and PEG-MGF
The second PCAC five, checked October 3, 2026: no date yet for the meeting; FDA's own risk statements and the human evidence for LL-37, GHK-Cu, dihexa, melanotan II and PEG-MGF.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Looksmaxxing and Peptides: What Young Men Are Being Sold
Looksmaxxing and peptides, checked October 3, 2026: what young men are sold for tanning, leanness, skin and height, what the evidence shows, the risks, and what parents should know.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Reading a Peptide Study: The Evidence Ladder From Petri Dish to RCT
How to read a peptide study, as of October 3, 2026: the evidence ladder from cell culture to randomised trials, with one real peptide paper per rung and how our grades use it.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
The Peptide Drug Pipeline in 2026: From Phase 1 to Filing
The peptide drug pipeline as of October 3, 2026: ten US approvals this year, 331 INN-named peptides at phase 2 or later, the obesity race and the readouts due this quarter.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
What Makes a Peptide a Peptide? (And Why MK-677, Orforglipron and NAD+ Aren't)
What makes a peptide a peptide, checked October 3, 2026: FDA's 40-amino-acid line, peptidomimetics, and why MK-677, orforglipron and NAD+ are not peptides.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
How to Spot a Fake COA in 60 Seconds
How to spot a fake peptide COA, checked October 3, 2026: a seven-point checklist built from our COA Decoder's rules, with a worked mass check and what independent tests found.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptide Blends: How to Work Out Each Component's Dose in a Fixed-Ratio Vial
Peptide blend dose maths, checked October 3, 2026: step-by-step per-unit arithmetic, reference tables for six compositions, and why no blend dose has evidence behind it.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Serious Reactions to Injected Peptides: The Conference Cases and What They Teach
Serious reactions to injected peptides, checked October 3, 2026: the RAADFest cases, Nevada's fines, FDA's immunogenicity warnings and how reactions happen.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Endotoxins, Heavy Metals and TFA: The Contaminants a COA Rarely Shows
What a peptide COA rarely shows, checked October 3, 2026: endotoxin limits, sterility, heavy metals, residual solvents and TFA, with what tests of online vials found.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
PCOS and Peptides: GLP-1 Evidence vs Everything Else
PCOS and peptides, checked October 3, 2026: GLP-1 trials in PCOS, fertility and contraception cautions from the labels, and how little evidence other peptides have.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
How to Read a Peptide Serum Label: Every INCI Peptide Name Decoded
Peptide serum labels decoded, checked October 3, 2026: what INCI peptide names mean, 2,616 peptide names in the EU register, and the evidence behind common ones.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptides for Hair Loss: GHK-Cu, Capixyl, PTD-DBM and What the Trials Show
Peptides for hair loss, checked October 3, 2026: GHK-Cu, Capixyl and PTD-DBM measured against minoxidil and finasteride trials, and what is missing.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Copper Peptides With Vitamin C, Retinol or Acids: What the Chemistry Says
Copper peptides with vitamin C, retinol or acids, checked October 3, 2026: what the chemistry shows, what it does not, and the missing skin studies.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Argireline vs Botox: Can a Topical Peptide Really Relax Wrinkles?
Argireline vs Botox, checked October 3, 2026: the peptide's trials, how little reaches the muscle, Botox Cosmetic's label results, and the safety limits of each.
Last updated: October 3, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
DSIP (Emideltide): Why the FDA Committee Rejected the Sleep Peptide
DSIP (emideltide), checked October 2, 2026: what its sleep trials found, why it remains a riddle, and why the FDA's compounding committee rejected it.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Semax and Selank: The Evidence Base Behind Russia's Nasal Peptides
Semax and selank, checked October 2, 2026: Russian approvals, what the human studies measured, the semax PCAC vote, and WADA status.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Khavinson Bioregulators: A Critical Guide to Russia's Short-Peptide Program
Khavinson bioregulators, checked October 2, 2026: the extracts and short peptides, their registration status, and what the PubMed record shows about the evidence.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Epitalon and Telomeres: What the Studies Actually Measured
Epitalon and telomeres, checked October 2, 2026: what each study measured in cells, mice and people, what FDA reviewers flagged, and the PCAC vote.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
SS-31 (Elamipretide) Became a Drug: What Its Approval Means and Doesn't
SS-31 (elamipretide) is FDA-approved as Forzinity for Barth syndrome. What the approval rests on, the failed trials elsewhere, and what it does not validate.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
MOTS-c: From Exercise-Mimetic Science to the FDA's Compounding Committee
MOTS-c, checked October 2, 2026: what the mouse and human studies measured, the July 2026 compounding-committee vote, and its WADA S4.4.1 ban.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Tesamorelin: The FDA-Approved GHRH Analog and Its Visceral-Fat Evidence Beyond HIV
Tesamorelin (Egrifta), checked October 2, 2026: visceral-fat trials in HIV, fatty-liver research, why it is not a weight-loss drug, and IGF-1 monitoring.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
TB-500 Is Not Thymosin Beta-4: The Fragment Confusion Behind Almost Every Claim
TB-500 vs thymosin beta-4: the 43-amino-acid protein has human trials, the 7-amino-acid fragment sold as TB-500 has none. Which evidence belongs to which.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
BPC-157 and Cancer: What the Angiogenesis Argument Gets Right and Wrong
Does BPC-157 cause cancer? What the angiogenesis argument gets right, what it cannot show, what FDA reviewers found and how little human data exists.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
GLP-1 Pens and Vials Decoded: Clicks, Units and Dose Math for Every Device
Zepbound vials, Mounjaro KwikPens, Wegovy and Ozempic pens: every device's strengths, volumes and concentrations from the current labels, and the dose math.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Compounded, Branded or 'Research' Tirzepatide: Identity, Purity and Law Side by Side
Compounded, branded or research tirzepatide: who verifies identity and purity, where each stands legally as of October 2026, and what testing has found.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Comparison
Retatrutide vs CagriSema vs Tirzepatide: The Next-Generation Scorecard
Retatrutide vs CagriSema vs tirzepatide, trial by trial: weight loss and the estimand behind it, side effects, mechanisms and FDA status as of October 2026.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Regulation
The 2026 Peptide Enforcement Timeline: Warning Letters, Rulings and Deadlines, Sourced
FDA peptide actions in 2026, in date order and sourced to government documents: warning letters, the Category 2 removals, the GLP-1 503B proposal and the PCAC votes.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Stopping a GLP-1: The Weight-Regain Data and What Actually Helps
Stopping a GLP-1: STEP 1 and SURMOUNT-4 show most of the lost weight returns within a year. What the data says about exercise, staying on treatment and tapering.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Amylin: The Hormone Behind the Next Weight-Loss Wave (Cagrilintide, Petrelintide, Eloralintide, Amycretin)
Amylin drugs explained: pramlintide, cagrilintide and CagriSema, petrelintide, eloralintide and amycretin, with each program's phase, trial results and status as of October 2026.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Do Peptides Show Up on Drug Tests? Detection, WADA and Why Athletes Still Get Caught
Do peptides show up on drug tests? Not on the federal workplace panel. Anti-doping labs can detect BPC-157, TB-500 and GHRPs, and many cases start without a positive test.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
GLP-1s and Birth Control: Why Tirzepatide Can Make the Pill Less Reliable
GLP-1s and birth control, checked October 2, 2026: tirzepatide labels advise backup contraception for 4 weeks after starting and each dose increase; the Ozempic babies reports explained.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Muscle Loss on GLP-1s: What the Body-Composition Data Shows
Muscle loss on GLP-1 drugs, checked October 2, 2026: lean mass is 25-35% of weight lost, about the same as diet alone; lean mass is not all muscle; resistance training and protein help.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Melanotan II Tanning Injections and Nasal Sprays: The Mole and Melanoma Evidence
Melanotan II tanning injections and nasal sprays, checked October 2, 2026: melanoma and mole case reports, regulator warnings in the UK, Australia and US, and what afamelanotide's approval does and doesn't mean.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Glutathione Injections and IV Drips: The Tripeptide's Evidence and Its Risks
Glutathione injections and IV drips, checked October 2, 2026: oral vs IV evidence, skin-lightening trials, regulators' warnings, and FDA's August 2026 alert on at least 30 adverse events.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptide Clinics: 12 Questions to Ask Before You Pay
Twelve questions to ask a peptide clinic before you pay: prescriber licensing, 503A and 503B pharmacies, what can legally be compounded, testing, evidence, monitoring and the red flags, checked October 2, 2026.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Fact-check
Podcast Peptide Claims, Fact-Checked: What the Studies Behind the Soundbites Show
Eight BPC-157 claims from the June 2026 Huberman Lab peptides episode, checked against FDA's records, WADA's list and the studies: six hold up, one date is wrong, one can't be checked.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
What Peptide Therapy Really Costs in 2026: Clinic, Compounded and Branded
What peptide therapy costs in 2026: Zepbound, Wegovy and Foundayo cash prices read at source on October 2, where compounded GLP-1s and BPC-157 stand legally, and what clinic prices leave out.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
How Long Do Reconstituted Peptides Last? What Stability Studies Actually Measured
Approved peptide labels allow anywhere from 3 hours to 60 days after mixing or first use. What those periods measure, why powder outlasts solution, and why the folklore '30 days' has no source.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Bacteriostatic Water vs Sterile Water vs Saline: Which to Use, Why, and How Long It Lasts
What separates bacteriostatic water, sterile water for injection and saline, why benzyl alcohol is there, where the 28-day rule comes from, and which approved peptides name a diluent on their label.
Last updated: October 2, 2026 · Reviewed by Grey Peptides Editorial Board
Reference
Every FDA-Approved Peptide Drug, Explained (2026 Edition)
Every peptide drug FDA has approved, checked against Drugs@FDA: 56 peptides and 35 larger protein hormones, with approval date, class and current US status. As of October 1, 2026.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Comparison
Peptides That Raise Testosterone: Kisspeptin, Gonadorelin and hCG Compared
How kisspeptin, gonadorelin and hCG raise testosterone, what each does to LH, FSH and testicular testosterone, what the human studies measured, fertility on TRT, and approval status. As of October 1, 2026.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Comparison
Peptides vs SARMs vs Steroids vs TRT: A Mechanism-Level Comparison
Peptides, SARMs, anabolic steroids and TRT compared by what they act on, what they do to your own testosterone, their legal and WADA status, and the quality of the evidence. As of October 1, 2026.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Safety explainer
Peptides, GLP-1s and Pregnancy or Breastfeeding: What the Labels and the Data Say
What the approved labels actually say about semaglutide and tirzepatide in pregnancy and breastfeeding, the stop-before-conception line, the contraceptive instruction most people miss, and why research peptides have no answer at all. As of October 1, 2026.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Evidence review
Peptides for Menopause: An Evidence Table for Every Compound Marketed to Women Over 40
Every peptide marketed to women in midlife, with its evidence grade, its approved status and what menopause societies recommend first. Includes the label line that excludes postmenopausal women from the best-known one. As of October 1, 2026.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Evidence review
Collagen Peptides: What the Randomised Trials Show for Skin, Joints and Bone
What randomised trials and meta-analyses show for oral collagen peptides on skin, joints and bone: the effects measured, the doses studied, the funding behind the trials and what is still untested. As of October 1, 2026.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
Copper Peptides (GHK-Cu) for Skin: What Fifty Years of Research Actually Shows
GHK-Cu has decades of lab and animal data behind it and very little in human skin. What the trials found, why the cream barely gets in, what product labels can claim, and the myths.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
Oral vs Injectable vs Nasal BPC-157: What the Bioavailability Data Actually Say
No study has measured how much BPC-157 a person absorbs by mouth or nose. What the one formal pharmacokinetic study, the rat drinking-water experiments and the stability claims do and do not show.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
Pentadeca Arginate (PDA): Is It Really 'BPC-157 2.0'?
PDA is sold as a more stable, compliant BPC-157. It is described as BPC-157's own sequence as a different salt, has no studies of its own, and FDA treats a peptide's salt forms as separate ingredients.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
'Chinese Peptides,' Explained With Data: Imports, Crypto Payments and What Testing Finds
What the numbers say about 'Chinese peptides': customs import values, crypto payments traced on the blockchain, and what independent and peer-reviewed testing finds. No vendors named.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
Can a Doctor Prescribe BPC-157 in 2026? What the PCAC Vote Changed, and What It Didn't
A doctor can write a prescription for BPC-157, but no US pharmacy has a lawful path to compound it. What the July 2026 PCAC vote did, what FDA has not done, and what would change it.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Analysis
CagriSema's FDA Decision: What It Is, What the Trials Showed, and What to Watch
CagriSema combines cagrilintide and semaglutide, and FDA is reviewing it for weight management. What REDEFINE 1 and 2 and the REIMAGINE trials actually found, and what is still unknown.
Last updated: October 1, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
How to Store Peptides: What Labels, Pharmacies and the Evidence Actually Say
How to store peptide powder and mixed vials: what approved labels say, why the fridge door is the wrong place, what the 28-day rule means, and what is simply unknown, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Category 1, Category 2, 503A, 503B, Approved: The Five Terms That Decide Whether You Can Get a Peptide
What approved, 503A, 503B, Category 1 and Category 2 mean for getting a peptide in the US, with a status table for BPC-157, TB-500 and 12 others, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
What "Research Use Only" Really Means on a Peptide Vial
Where the "research use only" label comes from, why FDA and federal prosecutors look past it, and what it means for buyers, with the cases and rules behind it, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptides for Anti-Aging and Longevity: What the Evidence Shows
Which anti-aging peptides have human evidence? Growth hormone secretagogues, elamipretide, MOTS-c, epithalon, NAD+ and GHK-Cu, graded by what trials show, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Science
The Oral Peptide Breakthroughs of 2026: The Wegovy Pill, Icotrokinra and Enlicitide
Three peptide medicines now come as tablets: semaglutide for weight, icotrokinra for psoriasis and enlicitide for LDL cholesterol. How they get past the gut, why 1-2% absorption is enough, and why most peptides still can't, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Evidence
GLP-1 Microdosing: What the First Real-World Data Shows, and What No Trial Has Tested
15% of injectable GLP-1 users in a 2026 survey said they microdose, mostly for side effects and cost. What the trials show about lower doses, what splitting a dose does, and what no trial has tested, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptide Side Effects: What the Labels and Trials Actually Report
What the evidence says about peptide side effects, drug by drug: measured rates from labels for approved peptides, trial findings for the rest, and where there is simply no safety data, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
MK-677 (Ibutamoren): The Complete Guide to the Oral Secretagogue That Never Became a Drug
What MK-677 is (not a peptide), what its trials in older adults, Alzheimer's disease and hip fracture found, its side effects, FDA's 2024 vote and 2025 warning letter, and WADA status. Checked as of September 28, 2026.
Last updated: September 28, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Sermorelin: The Complete Guide, From Geref to the Compounding Pharmacy
What sermorelin is, its two US approvals as Geref and why they ended, the pediatric evidence, what has and has not been studied in adults, dosing and legal status. Checked as of September 28, 2026.
Last updated: September 28, 2026 · Reviewed by Grey Peptides Editorial Board
Dosing guide
Insulin Syringe Units Explained: U-100, U-40 and Why '10 Units' Is Not a Dose
What the 'units' on an insulin syringe measure, how to turn a dose in mg into units at any concentration, U-100 vs U-40 syringes, pens, and the dosing errors FDA has documented. With the calculator built in.
Last updated: September 28, 2026 · Reviewed by Grey Peptides Editorial Board
Safety explainer
Do Peptides Cause Cancer? A Compound-by-Compound Look at Angiogenesis, GH/IGF-1 and the Real Data
Do peptides cause cancer? The four mechanisms behind the worry, what human data exist for BPC-157, TB-500, GH secretagogues, epitalon and GLP-1 drugs, and what FDA said. As of September 28, 2026.
Last updated: September 28, 2026 · Reviewed by Grey Peptides Editorial Board
Explainer
KLOW vs GLOW vs Wolverine: What's Actually in Each Blend, and What the Evidence Covers
What KLOW, GLOW and Wolverine vials say they contain, what the evidence on BPC-157, TB-500, GHK-Cu and KPV covers, and what no one has tested. As of September 26, 2026.
Last updated: September 26, 2026 · Reviewed by Grey Peptides Editorial Board
Explainer
What Is 'GLP-3'? Decoding the Gray-Market Code Names for Retatrutide, Tirzepatide and Semaglutide
GLP-3 is not a hormone. It is a seller's nickname for retatrutide, which is approved nowhere. What the GLP-1, GLP-2 and GLP-3 labels mean, as of September 26, 2026.
Last updated: September 26, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
How to Reconstitute Peptides: The Liquid, the Technique and the 28-Day Rule
How freeze-dried peptides are mixed: which liquid, how to add it, what the vial's milligrams really mean, and why 28 days is a sterility rule, not a stability measurement, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
BPC-157 vs TB-500: Which Repair Peptide Should You Choose?
BPC-157 and TB-500 are the two most widely used tissue repair peptides, but they work through fundamentally different mechanisms. BPC-157 promotes healing primarily through angiogenesis (new blood ves
Last updated: April 14, 2026 · 14 min read · Reviewed by Grey Peptides Editorial Board
Guide
Peptides for Muscle Growth: What the Human Trials Show
Do peptides build muscle? Growth hormone, CJC-1295, ipamorelin, MK-677, IGF-1 LR3 and myostatin blockers, judged by their human trials and regulatory status, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Are Peptides Legal? The Complete 2026 Country-by-Country Guide
The legality of peptides depends on the specific peptide, your country, and how you intend to use it. Some peptides are FDA-approved prescription medications (semaglutide, tirzepatide, PT-141). Others
Last updated: April 14, 2026 · 13 min read · Reviewed by Grey Peptides Editorial Board
Guide
BPC-157 + TB-500 Stack: The Complete Repair Protocol Guide
The BPC-157 + TB-500 stack is the most widely used peptide combination for tissue repair. It works because the two peptides heal through completely different mechanisms — BPC-157 builds new blood vess
Last updated: April 14, 2026 · 12 min read · Reviewed by Grey Peptides Editorial Board
Guide
Peptides for Fat Loss: What the Trials Show
Which fat-loss peptides have trial evidence? Semaglutide, tirzepatide, retatrutide, CagriSema, survodutide, tesamorelin and AOD-9604, compared by what their trials found, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
CJC-1295 and Ipamorelin Together: What Each Does, and What Nobody Has Tested
Why CJC-1295 and ipamorelin are sold together, the evidence for each, the class evidence for combining GHRH with a ghrelin agonist, and the trial that has never been run. Checked as of September 28, 2026.
Last updated: September 28, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
TB-500 (Thymosin Beta-4): The Complete Research Guide, Checked Against the Evidence
What TB-500 is and is not, what thymosin beta-4 research shows, the one study of TB-500 itself, dosing, safety, US compounding and WADA status. Checked as of September 28, 2026.
Last updated: September 28, 2026 · Reviewed by Grey Peptides Editorial Board
Comparison
Semaglutide vs Tirzepatide: What the Head-to-Head Trials Show
Tirzepatide beat semaglutide in both head-to-head trials; semaglutide has the longer outcomes record. SURPASS-2, SURMOUNT-5, SELECT, SURPASS-CVOT, side effects and what happens on stopping, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
CJC-1295: The Complete Guide, With and Without DAC, Checked Against the Evidence
CJC-1295 with DAC (DAC:GRF) lasts days; 'no DAC' is Mod GRF 1-29, a different short-acting peptide. The two human studies, half-life, safety, compounding and WADA status, checked September 28, 2026.
Last updated: September 28, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Peptides for Healing Injuries: What Has Been Tested in People
Do healing peptides work? BPC-157, TB-500, thymosin beta-4, LL-37 and GHK-Cu, separated into animal studies and human trials, with their regulatory status, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
Ipamorelin: The Complete Guide, Checked Against the Evidence
What ipamorelin is, where its famous selectivity was actually measured, its two human studies, FDA's 2023 safety listing, dosing and WADA status. Checked as of September 28, 2026.
Last updated: September 28, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
How to Judge Quality Claims from Peptide Sellers
What a peptide seller's certificate of analysis must show (identity, purity, quantity, endotoxin, sterility), the warning signs, and why documents can be wrong, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board
Guide
GLP-1 Drug Interactions: What the Labels Actually Say
Which medicines interact with semaglutide and tirzepatide, and how we know: slowed stomach emptying, low blood sugar with insulin, the tirzepatide contraceptive rule, levothyroxine, warfarin and surgery, as of September 30, 2026.
Last updated: September 30, 2026 · Reviewed by Grey Peptides Editorial Board