Peptide Reconstitution, Dose & Blend Calculator
Pick a peptide, your dose, and how often you take it. The calculator shows how long a vial lasts, how much bacteriostatic water to add, and exactly how many units to draw on the syringe — all in one place. There's a separate blend tab for multi-peptide vials.
Result
Each dose delivers
How to read this (and why the math works)
How long a vial lasts = vial size ÷ dose, spread across how often you inject. A 10 mg vial at 2 mg per dose is 5 doses — about 5 weeks if you inject once weekly. This does not depend on the water — adding more or less water never changes how many doses are in the vial.
What the water changes is the draw. Concentration = mg of peptide ÷ mL of water. More water = a more dilute solution = more units pulled per dose; less water = fewer units. The calculator suggests a water amount that makes each dose land on a clean, easy-to-read number of units.
Units to draw. Every insulin syringe is marked so 1 unit = 0.01 mL. The U-100 / U-50 / U-30 choice only changes the barrel size and the marks you read against — the unit number for a given volume is the same.
Blends. In a multi-peptide vial, each compound has its own concentration (its mg ÷ the shared water). Every draw delivers all of them in proportion.
Reconstitution etiquette: let the water run down the inside wall — don't spray it onto the powder. Swirl gently, never shake. Store reconstituted vials in the fridge.
Educational use only. Peptides discussed in OHM content are sold for research purposes and are not FDA-approved drugs. Pre-filled “typical” values are common starting points for illustration, not a prescription. Nothing on this page is medical advice. Consult a qualified clinician before starting any protocol.