The Complete Peptide Reconstitution Guide (With a Units Cheat Sheet)

This is the page the whole peptide series hangs from: the complete peptide reconstitution guide, with the full method explained once, properly, and the peptide cheat sheet 2026 below it — the master table of vial sizes, water volumes, concentrations and syringe units that our compound guides keep referring back to. If the other five articles are the worked examples, this peptide dosing guide is the textbook they are examples of. One boundary, stated before anything else: this guide teaches arithmetic and handling. It does not recommend doses for anyone, it makes no claim about what any compound does, and every amount in its tables is a worked example. Dosing decisions belong to a qualified clinician; drawing accurately is what I can help with.

The whole method, in four formulas

Every page in this series — and every peptide dosage guide worth its bookmarks — runs on four lines:

The one conversion that guards all four is 1 mg = 1,000 mcg. Nearly every serious error I have seen in this topic was born there: an amount read in milligrams and calculated in micrograms, or the reverse, is wrong by a factor of a thousand. Convert first, write the converted figure down, then calculate — never convert in your head mid-formula.

The reconstitution procedure, step by step

1. Prepare. Wash your hands. Gather the vial, bacteriostatic water, an alcohol swab and a fresh syringe. Check the vial’s label — compound and milligrams — against what you intend to mix.
2. Swab. Wipe the vial top and the water vial top; let the alcohol dry.
3. Draw the water. Pull your planned volume of bacteriostatic water into the syringe. The volume is a decision, not a detail: it sets the concentration for the vial’s whole life.
4. Add it gently. Needle through the stopper, stream aimed at the glass wall so the water runs down onto the powder. Never jet water directly onto the powder cake.
5. Dissolve. Rest the vial a few minutes, then roll it between your palms or swirl gently until completely clear. Do not shake — foam is the enemy of both accuracy and the solution itself.
6. Label. Compound, date mixed, and the concentration (“2,500 mcg/ml”). An unlabelled clear vial is a future error with a date on it.
7. Store. Straight into the refrigerator, upright, away from the light and the freezer compartment.

The peptide cheat sheet (2026)

Here is the reconstituting peptides guide condensed into one table — the nine pairings I am asked about most, computed at three standard example amounts. Print this page and tape it inside the cabinet door; that is what a cheat sheet is for.

U-100 syringe units throughout. Pairings outside the table — every other vial and volume — run in the peptide calculator, which is this table’s formula with a keyboard.

Reading the syringe without mistakes

A U-100 insulin syringe is graduated in units that are hundredths of a millilitre: the 10 mark is 0.10 ml, the 37 mark is 0.37 ml. Two habits prevent most misreads. First, know your syringe’s capacity — a 1 ml syringe has 100 units with marks every 2 units on many models, while a 0.5 ml syringe (50 units) spaces the same numbers twice as far apart and is the kinder tool for small draws; a “unit” is the same volume on both, but the reading precision is not. Second, read at eye level with the plunger edge on the line, and expel air bubbles before reading, not after — a bubble is volume you counted but did not draw.

Storage and handling, stated conservatively

Unmixed (lyophilised) vials keep longest cool, dark and dry; most suppliers advise refrigeration and many say the freezer is acceptable for sealed powder — your supplier’s stated conditions govern. Once reconstituted, the conservative consensus is: refrigerate at 2–8 °C, protect from light, never freeze the solution unless the supplier explicitly allows it, and use it within a few weeks — suppliers most commonly advise around 30 days. Discard any vial that becomes cloudy, grows particles, or was left warm for an extended period; no draw is worth a contaminated one. I am deliberately not attaching per-compound shelf lives: for research compounds those figures are conventions, not verified data, and a guide that invents precision it does not have is worse than one that admits the range.

The error checklist

• mg ↔ mcg slip (×1,000). Convert first, in writing.
• Borrowed units. A unit count is meaningless without its concentration; never copy one from another vial, person or page.
• Unrecorded water volume. The concentration exists only if you wrote it down — on the vial.
• Shaking. Swirl. Foam damages solutions and ruins meniscus readings.
• Blend blindness. In a blend, each compound has its own concentration in the shared water, and draws always carry all compounds in the vial’s fixed ratio.
• IU confusion (HGH). Somatropin speaks IU: 1 mg ≈ 3 IU. Bridge the systems before calculating, never during.

The compound guides

This method, applied compound by compound with full tables, lives in the rest of the series:

• BPC-157 and TB-500 reconstitution math — the 5 mg vial three ways, plus blend-vial arithmetic.
• Tirzepatide and semaglutide vial math — the big vials, 10 mg to 60 mg.
• Retatrutide reconstitution — the investigational compound, with its extra cautions.
• Ipamorelin, tesamorelin, sermorelin and CJC-1295 — the GH secretagogue family, plus the HGH IU bridge.
• GHK-Cu, MOTS-c, AOD 9604, melanotan and more — the rest of the cabinet, including the KLOW blend.

One vial, end to end: a complete worked example

Everything above, applied once to a single vial so the chain is visible in one place. The vial holds 10 mg. I add 2 ml of bacteriostatic water — chosen, as the procedure section argues, to land on a round concentration: 10,000 mcg ÷ 2 ml = 5,000 mcg/ml, written on the label with the date. Now the example amounts, each one the same two operations (divide by the concentration, multiply by 100): 250 mcg → 0.05 ml → 5 units; 500 mcg → 0.10 ml → 10 units; 750 mcg → 0.15 ml → 15 units; 1 mg → 0.20 ml → 20 units; 2 mg → 0.40 ml → 40 units. Draws per vial at 500 mcg: 10,000 ÷ 500 = 20 on paper. Check any line of that against the cheat sheet’s “10 mg + 2 ml” row and it agrees — it must, because the sheet was built by exactly this method. If your numbers ever disagree with the table, the wrong step is almost never the division; it is the concentration you started from, which is to say the water volume you actually used, which is to say the thing you wrote on the label — or didn’t.

When the maths tells you the setup is wrong

Sometimes the honest answer to a calculation is “change the setup”. Two results should send you back to the water decision rather than to the syringe: a draw under about 5 units, where printed lines are too coarse for the percentage accuracy anyone should accept, and a draw over 100 units, which a single standard syringe cannot hold at all. The fix in both directions is dilution arithmetic run backwards: pick the draw you want (say 20 units = 0.20 ml) for the amount you are working with (say 500 mcg), and the concentration you need is 500 ÷ 0.20 = 2,500 mcg/ml — for a 5 mg vial, that is 5,000 mcg ÷ 2,500 = 2 ml of water. Working backwards from a comfortable draw to a water volume is the single most useful habit this guide teaches; it converts the water from an afterthought copied off a forum into the deliberate choice it actually is.

A note on the water itself

Bacteriostatic water is sterile water containing 0.9% benzyl alcohol, which is what makes a multi-use vial of water safe to enter repeatedly — and what makes it, rather than plain sterile water, the default for reconstitution meant to last more than a day. Plain sterile water suits single-use reconstitution (the tesamorelin kit in this series is the standard example). What never belongs in a vial: tap water, distilled drinking water, or saline improvised at home — sterility is the entire point of the exercise, and it cannot be approximated. Check the water vial’s expiry as you would the peptide’s, and discard it if the seal or clarity is in doubt; the cheapest component in the process protects all the others.

Sources: standard reconstitution arithmetic (concentration = mg × 1,000 ÷ ml; draw = amount ÷ concentration; U-100 syringe, 100 units = 1 ml; somatropin 1 mg ≈ 3 IU) and the handling conventions commonly published by research-supply and pharmacy guidance (bacteriostatic water, refrigeration at 2–8 °C, use within roughly 30 days of mixing). Every cheat-sheet cell recomputed for this article; the sheet is dated 2026 and will be revised with the guide. Educational arithmetic only — not medical advice.