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Peptide reconstitution calculator
Enter your vial size, bacteriostatic water volume, and desired dose — get the exact units to draw on a standard U-100 insulin syringe.
Inputs
Selecting a preset fills the typical vial size and a starting dose. Override any value below.
Total peptide per vial, in milligrams (mg). For HCG, total IU.
Volume of BAC water you'll add. Most common: 1, 2, or 3 mL.
Amount of peptide per dose (not volume drawn).
Result
How this works
Concentration is peptide divided by water: a 10 mg vial in 2 mL of BAC water gives a 5 mg/mL solution.
Units refer to the markings on a U-100 insulin syringe, where 100 units = 1 mL. So 0.5 mL = 50 units, 0.25 mL = 25 units. We output the unit count directly so you can draw without doing math.
Doses per vial is how many full doses the reconstituted vial provides at the dose you entered — useful for planning or budgeting.
HCG note: HCG is sold in International Units (IU). Selecting IU in the dose field treats the vial value as total IU rather than mg.
Reconstitution FAQ
How do I reconstitute a lyophilized peptide?
Slowly add the chosen volume of bacteriostatic water to the vial along the side wall, then gently swirl until the powder fully dissolves. Do not shake — it can damage the peptide. Once reconstituted, store refrigerated.
How much bacteriostatic water should I add?
There's no single right answer — it depends on your dose. For a 10 mg vial, 1 mL gives a concentrated 10 mg/mL solution (small draws), 2 mL gives a balanced 5 mg/mL, and 3 mL gives a more dilute 3.33 mg/mL (easier to measure tiny doses).
What are units on an insulin syringe?
A standard U-100 insulin syringe has 100 units per 1 mL. So 50 units = 0.5 mL, 25 units = 0.25 mL. The calculator gives you the unit count to draw directly so you can skip the conversion.
How long does reconstituted peptide last?
Most reconstituted research peptides remain stable for 4–6 weeks when refrigerated at 2–8°C. Stability varies — GHK-Cu and BPC-157 are more stable, CJC-1295 (no DAC) degrades faster. Bacteriostatic water's 0.9% benzyl alcohol prevents microbial growth.
Can I use sterile water instead of bacteriostatic water?
Sterile water can be used but limits the vial to a single use. Bacteriostatic water (0.9% benzyl alcohol) allows multi-dose use over several weeks.
What size syringe should I use?
For most research peptide doses, a 1 mL (100 unit) U-100 insulin syringe is standard. For very small doses (under 10 units), a 0.3 mL (30 unit) syringe gives more granular markings.
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