Myristoyl Pentapeptide-17
Myr-KLAKK-NH2, the lipopeptide in many eyelash and brow serums. PubMed holds no study of it, so claims about lash growth rest on marketing, not published data.
Myristoyl pentapeptide-17 is a synthetic lipopeptide, a myristoyl group on the pentapeptide amide Lys-Leu-Ala-Lys-Lys-NH2 (PubChem's record gives the structure under its INCI name). It is a common ingredient of eyelash and eyebrow serums, but a title-and-abstract search of PubMed for its INCI name, matched word by word, finds no study of it, and no eyelash or eyebrow paper names a myristoyl peptide. It is not a drug and has no drug approval.
No dosing data yet Details ↓
Recommended Dosing
No dosing data yet
This page has no dosing data yet.
Mechanism of action
Not established: no published study describes its action on hair follicles or any other tissue.
Primary uses
- Cosmetic eyelash and eyebrow serums
Typical dosing
No controlled study of the ingredient on its own states an amount used on skin, and a supplier's use level is not a source on this site, so none is given.
Regulatory status
Not a drug: listed as a cosmetic ingredient under its INCI name (PubChem CID 127264611). Drugs@FDA and the EMA medicines list hold no record for it (searched October 28, 2026).
Status as of this entry's last review, October 28, 2026. Approvals, compounding rules and sport rules change; the regulatory tracker is checked more often.
What we checked
Myristoyl pentapeptide-17 is the lash-serum lipopeptide. It has no published literature; this section records what can be checked.
Identity, computed
| Structure | myristoyl-Lys-Leu-Ala-Lys-Lys-NH2 (PubChem's IUPAC name, CID 127264611) |
| Formula | C41H81N9O6 (PubChem) |
| Molecular weight | 796.1 g/mol (PubChem) |
The calculator used elsewhere on this site does not handle a myristoyl cap, so the formula and weight are PubChem's, not computed here.
Regulatory status, read October 28, 2026
Drugs@FDA: 0 records for “myristoyl pentapeptide-17”. EMA medicines list: 0 records for “myristoyl pentapeptide-17”. Run for semaglutide, the same queries return 6 and 5 records (and the registry search 80 trials), so a zero here is an absence, not a broken search. Not named on the WADA 2026 and 2027 Prohibited Lists. As a substance with no current approval for human therapeutic use, it falls under section S0 (non-approved substances), which is prohibited at all times; the lists were read on October 28, 2026.
What the maker or sellers claim
Claim, from cosmetic marketing: the ingredient lengthens or thickens eyelashes. No published study of it was found, in people or in the laboratory.
What we looked for and did not find
No published study of any kind, no registry record and no drug approval.
| Source | Query | Results, October 28, 2026 | What it was |
|---|---|---|---|
| PubMed | ("pentapeptide-17"[tiab] OR "pentapeptide 17"[tiab]) AND myristoyl[tiab] | 0 | the hyphenated INCI name is matched word by word (Q958): a phrase search for a hyphen-numbered name misses papers |
| PubMed | myristoyl[tiab] AND (eyelash*[tiab] OR lash[tiab] OR lashes[tiab] OR eyebrow*[tiab]) | 0 | any myristoyl peptide in an eyelash or eyebrow paper |
| ClinicalTrials.gov | myristoyl pentapeptide-17 | 0 | |
| Drugs@FDA (openFDA) | myristoyl pentapeptide-17 | 0 | |
| EMA medicines list | myristoyl pentapeptide-17 | 0 |
References
- [other] PubChem CID 127264611, Myristoyl Pentapeptide-17: formula C41H81N9O6, molecular weight 796.1. Read October 28, 2026. https://pubchem.ncbi.nlm.nih.gov/compound/127264611
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This entry is for educational purposes only and does not constitute medical advice. Dosing information reflects published regulatory or research data and is not a recommendation. Many compounds described here are not approved for human use in the United States. Consult a licensed medical professional before considering any peptide therapy.