Printable reconstitution chart

How this tool works · sources read October 1, 2026 · Grey Peptides Editorial Board

What the chart is, and what it is the inverse of

Our reconstitution calculator answers one question at a time: you name an amount, and it tells you the volume and the syringe units that deliver it. This page answers the opposite question for every mark at once. You give it the milligrams on the vial and the millilitres of liquid you added, and it prints what each unit on a U-100 insulin syringe delivers, from one unit upward.

The arithmetic is three lines, and it is the same arithmetic the calculator states on its own page. The milligrams in the vial divided by the millilitres added give the concentration. A U-100 syringe holds 100 units in one millilitre, so a single unit is 0.01 mL. Each unit therefore delivers the concentration divided by a hundred. A 5 mg vial reconstituted with 2 mL holds 2,500 micrograms per millilitre, so one unit is 25 micrograms, ten units are 250, and fifty units are 1,250.

Those two tools are checked against each other on every build. A test takes each row the chart prints, pushes the amount back through the calculator's formula, and requires the original unit mark to come back out; it runs five vial-and-water combinations and fails the build on any disagreement. A chart that quietly disagreed with the calculator printed beside it would be worse than no chart at all.

Why a printed sheet rather than a screen

The moment that goes wrong is not the arithmetic. It is the moment a syringe is in one hand and a phone has locked itself in the other, or the vial from last month is sitting beside the vial from this month and both are clear liquid in identical glass. A sheet of paper does not sleep, does not need a password, and can be taped to the box.

That is also why the generated sheet carries its own identity. Every printed chart states the milligrams, the millilitres, the resulting concentration, the micrograms per unit and the date it was generated, and it offers a free-text label for the lot or the date the vial was opened. A chart with no vial written on it is a hazard as soon as a second vial exists, because the same table of numbers is correct for one and wrong for the other. Two vials of the same compound reconstituted with different volumes produce completely different charts: 5 mg in 2 mL gives 25 micrograms a unit, and the same 5 mg in 1 mL gives 50.

The sheet prints without the navigation, this explainer or the site footer, so one page is one chart. The browser's print dialogue will save it as a PDF if you would rather keep it than print it, and the copy button puts the whole table on the clipboard as tab-separated columns for a spreadsheet.

The chart says what a draw delivers, never what to draw

Nothing on this page proposes an amount. The boxes start at 5 mg and 2 mL because that is the commonest vial presentation sold, not because it is a recommendation, and the table shows what each mark delivers rather than which mark to use. That is a deliberate limit, and it is the same limit our other calculators keep.

The reason is that for most of the compounds people reconstitute at home, no human dose has been established at all. BPC-157 is the clearest case: its entire published human record is a telephone chart review of sixteen knee patients and a two-person safety pilot of intravenous infusion.^{1 2} There is no trial from which a milligram figure could be derived, so any number printed next to the word "dose" would be invented. Where a compound does have an approved product, the dose belongs to that product's label and its prescriber, not to a chart generator.

FDA's compounding advisory committee reviewed several of these peptides in July 2026, and our regulatory tracker follows what FDA has and has not decided since.³ Until something is approved, a correct calculation remains a correct calculation about an unapproved substance.

The chart is only as true as the label

Every number on the printed sheet rests on one assumption: that the vial contains what the label says. That assumption is testable, and when researchers have tested it the labels have not held up. Semaglutide vials test-purchased from illegal online pharmacies contained 28.6% to 38.7% more drug than their labels stated, at measured purities of 7.7% to 14.4% against the 99% those labels claimed.⁴ FDA has separately warned companies selling unapproved versions of these drugs falsely labelled for research use.⁵

If the vial holds more than the label claims, every row of the chart understates what a draw delivers, by the same proportion, invisibly. The chart cannot detect this and neither can arithmetic of any kind. Only an analysis of the vial itself can, which is what our verification guide is about, and why we are building a database of published independent test results rather than asking anyone to take a certificate on faith.

Two smaller limits apply to the arithmetic itself. It treats the liquid you add as the volume of the finished solution, ignoring the small volume the powder contributes — the same simplification the calculator makes — and it cannot know about liquid left in the vial, in the needle, or lost to the air. Neither matters much at these volumes, but both exist.

How long the sheet stays true

A chart describes a vial at the moment it was reconstituted. What happens afterwards is outside the arithmetic. Peptides in solution degrade, at rates that depend on the compound, the diluent, the temperature, the light and whether the preparation was sterile to begin with, and a vial reconstituted with plain sterile water has no preservative in it at all.

Pharmacy practice does not leave this to judgement. Compounded sterile preparations are given beyond-use dates set by how they were prepared and stored, under USP General Chapter <797>, rather than by how the contents look.⁶ A vial made up at a kitchen table has no such assignment at all, and a chart printed six weeks ago is arithmetically still correct about the vial it describes while possibly describing a vial that has changed.

The practical consequence is that the date on the sheet is not decoration. Print a new one when you make up a new vial, write the lot on it, and keep the old sheet with the old vial or throw both away together.

The rest of the arithmetic

Three other tools on this site do the neighbouring sums, all from the same conventions. The reconstitution calculator goes the other way, from an amount to a draw, and will suggest which volume of liquid makes a chosen amount land on a whole unit mark. The blend and stack calculator handles vials with more than one peptide in them, where a fixed ratio means no component can be drawn on its own. The mixing and compatibility guide covers what goes in the vial before any of this arithmetic applies.

Each compound's own entry in the encyclopedia sets out what has actually been measured in people, what its regulatory status is, and whether it is prohibited in sport. That is the context a chart cannot carry, and the reason the printed sheet names this site at the bottom: a page of numbers is not an endorsement of what the numbers describe.

Sources

1. Lee, E. et al. (2021). Intra-articular injection of BPC 157 for multiple types of knee pain. Alternative Therapies in Health and Medicine, 27(4), 8–13. PMID: 34324435
2. Lee, E. et al. (2025). A pilot safety study of intravenous BPC-157. (Two participants.) PMID: 40131143
3. U.S. Food and Drug Administration. Pharmacy Compounding Advisory Committee, July 2026 meeting materials. Read October 1, 2026. Source
4. Ashraf, A. R. et al. (2024). Multifactor quality and safety analysis of semaglutide products sold by online sellers without a prescription: market surveillance, content analysis, and product purchase evaluation study. Journal of Medical Internet Research, 26, e65440. PMID: 39509151
5. U.S. Food and Drug Administration. Medications containing semaglutide marketed for type 2 diabetes or weight loss, including warnings about products falsely labelled for research use. Read October 1, 2026. Source
6. United States Pharmacopeia. General Chapter <797>, Pharmaceutical Compounding — Sterile Preparations, which assigns beyond-use dates to compounded sterile preparations. Cited as a standard; usp.org refused automated access on October 1, 2026, so no link is given and no figure from it is quoted here.

This explainer describes how the tool works and what its numbers rest on. It is not medical advice and does not recommend any dose or product.