Peptide calculator for reconstitution and dosing

Add a measured volume of bacteriostatic water to the vial of powder, letting it run down the glass rather than onto the cake, then swirl gently until clear. Concentration is the vial amount divided by the water volume: 5 mg in 2 mL gives 2.5 mg/mL.

It depends on the concentration. At 2.5 mg/mL, 250 mcg is 0.1 mL, which is 10 units on a U-100 syringe, because each unit mark is 0.01 mL. Halve the water and the same dose becomes 5 units.

There is no single right amount. Vials are commonly mixed with 1 to 3 mL; more water gives a lower concentration and a larger, easier-to-read draw. The calculator shows the units for any volume so the draw lands in the readable range of the syringe.

Bacteriostatic water carries a 28-day in-use window once the stopper is punctured, so most sources discard a mixed vial at 28 days in the refrigerator. That figure comes from the preservative label, not from stability data on each peptide.

Multiply by 1,000: 1 mg is 1,000 mcg, so a 0.25 mg dose is 250 mcg and a 2 mg dose is 2,000 mcg. Vial labels are usually in mg and doses in mcg, which is where most calculation errors start.

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