What’s in your vial?
The total peptide amount printed on the label.
How much water are you adding?
Bacteriostatic water. More water = larger, easier-to-measure draws; the dose itself doesn’t change.
What dose do you want?
Per injection. Pick a peptide to autofill its typical research dose.
Which syringe?
All sizes use the same insulin-unit scale — 100 units = 1 mL.
Prefer a round number?
These water volumes land your 250 mcg dose exactly on a 5-unit mark:
Your draw
Draw to the 5-unit mark (0.05 mL)
The math: 10 mg ÷ 2 mL = 5 mg/mL, so each unit holds 50 mcg. Your 250 mcg dose is 0.05 mL — 5 units.
Unit-by-unit reference at 5 mg/mL
| Units | Volume | Dose |
|---|---|---|
| 10 | 0.10 mL | 500 mcg |
| 20 | 0.20 mL | 1 mg |
| 30 | 0.30 mL | 1.5 mg |
| 40 | 0.40 mL | 2 mg |
| 50 | 0.50 mL | 2.5 mg |
| 60 | 0.60 mL | 3 mg |
| 70 | 0.70 mL | 3.5 mg |
| 80 | 0.80 mL | 4 mg |
| 90 | 0.90 mL | 4.5 mg |
| 100 | 1.00 mL | 5 mg |
Good to know
What is reconstitution?
Peptides ship as a freeze-dried powder. Reconstitution means dissolving that powder in bacteriostatic water so it can be measured and drawn. The amount of water you add sets the concentration — it never changes the dose itself.
What is a “unit” on an insulin syringe?
Insulin syringes are marked in units, where 100 units = 1 mL on every size. A 30-unit syringe simply holds 0.3 mL. Once you know the concentration, units are just a volume reading.
How much water should I add?
Enough that your dose lands on an easy-to-read mark — typically 1–3 mL. More water means a larger draw for the same dose, which is easier to measure accurately. The “round number” suggestions in the calculator do this for you.
New to all of this? The beginner’s guide walks through reconstitution step by step.