Guide · 02
Peptide Calculator
Reconstitution volume, concentration and insulin units for a given vial, diluent and target amount. For research use only.
How the peptide calculator works
Lyophilised peptide
Enter the vial amount in mg, or pick a preset.
Add bacteriostatic water
Enter the diluent volume in mL.
Volume to draw
Read the exact mL and IU for the target amount.
Calculator
Preset loaded: XL-R3TA 25mg · 25 mg vial, 2 mL diluent · Back to product →
Awaiting input parameters
Enter values to initialise the calculation
Reconstitution reference
Concentration is the vial amount divided by the diluent volume. The same vial reconstituted with more bacteriostatic water gives a lower concentration and a larger volume per target amount, which is easier to read on an insulin syringe.
| Peptide | Bac water | Concentration |
|---|---|---|
| 5 mg | 1 mL | 5,000 mcg/mL (500 mcg / 10 IU) |
| 5 mg | 2 mL | 2,500 mcg/mL (250 mcg / 10 IU) |
| 10 mg | 2 mL | 5,000 mcg/mL (500 mcg / 10 IU) |
| 50 mg | 5 mL | 10,000 mcg/mL (1,000 mcg / 10 IU) |
- 1 mg = 1,000 mcg
- 1 mL = 100 IU
- 1 IU = 0.01 mL
Per-peptide presets
Load a vial size and its reference diluent volume from the catalogue, then adjust the target amount. Each preset links back to the product page and its specification.
Protocol notes
01 — Reconstitution
Add the calculated bacteriostatic water volume to the peptide vial slowly, along the inside wall. Gently swirl — never shake — peptides are fragile molecules.
02 — Calculation logic
Concentration = (peptide mg × 1,000) ÷ bac water mL. Volume = target amount mcg ÷ concentration. Insulin units = volume mL × 100.
03 — Storage
Store lyophilised vials at −20°C away from light. Once reconstituted, refrigerate at 2–8°C and use within 30 days. Never freeze reconstituted peptides.
04 — Syringe guide
0.3 mL (30 IU) — finest graduations for small volumes. 0.5 mL (50 IU) — standard. 1.0 mL (100 IU) — largest volume. If IU exceeds syringe capacity, use a larger syringe.
⚠ Research use only · Not for human consumption · Not evaluated by MHRA or FDA · Not medical advice