Reconstitution Math & Calculators

Reconstitution math is straightforward once you understand the formula: Concentration = Total peptide amount / Volume of water added. For example, a 5mg vial reconstituted with 2mL of BAC water yields a concentration of 2.5mg/mL (or 2,500mcg/mL). To draw a 250mcg dose at this concentration, you would draw 0.1mL, which equals 10 units on a standard U-100 insulin syringe (where 1mL = 100 units).

The amount of BAC water you add is a matter of convenience and precision. Adding less water creates a more concentrated solution (fewer units per dose, less injection volume) but makes precise dosing harder because small errors in the syringe represent larger dosing errors. Adding more water creates a dilute solution (more units per dose, larger injection volume) but allows more precise dosing. A common practice is to add 2mL of BAC water to a 5mg vial, or 1mL to a 2mg vial, creating round concentrations that are easy to work with. DoseCraft's reconstitution calculator handles this math for you.

Double-check your math before every injection, especially when switching between different peptides or concentrations. The most common dosing errors are confusion between mg and mcg (1mg = 1,000mcg), miscounting syringe units, and mixing up concentrations when using multiple peptides. Label every reconstituted vial clearly with the peptide name, concentration, date of reconstitution, and use-by date. Many experienced users create a reference card taped to their refrigerator with the concentration and units-per-dose for each active peptide.