Peptide reconstitution & dosage calculator

How the math works

1. Concentration = peptide in the vial (mg) ÷ bacteriostatic water (mL). A 5 mg vial with 2 mL of water is 2.5 mg/mL.
2. Volume to draw = your dose (mg) ÷ concentration. A 250 mcg dose is 0.25 mg, so 0.25 ÷ 2.5 = 0.1 mL.
3. Syringe units = volume (mL) × 100 on a U-100 syringe. 0.1 mL is the 10-unit mark.
4. Doses per vial = vial amount ÷ dose. A 5 mg vial at 0.25 mg per dose gives 20 doses.

Common reconstitution examples

Calculator FAQ

How do you calculate a peptide dose after reconstitution?

Divide the peptide amount in the vial (mg) by the bacteriostatic water you added (mL) to get the concentration in mg/mL. Then divide your desired dose by that concentration to get the volume to draw. On a U-100 insulin syringe, 1 mL equals 100 units, so multiply the volume in mL by 100 to get the unit mark.

How much bacteriostatic water should I add to a vial?

Any volume works as long as you do the math — more water simply means a more dilute solution and larger draws. Most people pick a volume that makes their usual dose land on an easy syringe mark, commonly 1 mL, 2 mL or 3 mL for a 5 mg or 10 mg vial.

What is the difference between mg and mcg?

1 mg equals 1000 mcg. Vials are usually labelled in mg while research doses are often written in mcg, so a 250 mcg dose is 0.25 mg.

What do the units on an insulin syringe mean?

A U-100 insulin syringe is marked in 100 units per 1 mL. So 10 units is 0.1 mL, 50 units is 0.5 mL. The units measure volume, not the amount of peptide.

Does this calculator give medical advice?

No. It is arithmetic only. It does not suggest, endorse or recommend any compound or dose. Talk to a licensed clinician before using any peptide.