The Math Behind Peptide Reconstitution
Lyophilized (freeze-dried) research peptides require reconstitution with a diluent—typically Bacteriostatic Water (BAC)—before subcutaneous administration. Because peptides are dosed in micrograms (mcg) or milligrams (mg), but syringes measure liquid volume in milliliters (mL) or "units", precise conversion math is required.
Standard U-100 insulin syringes hold exactly 1 mL of fluid, which is visually delineated into 100 tick marks (units). Therefore, 1 unit = 0.01 mL.
The Clinical Formula: Concentration and Volume
To determine how many syringe units equal your desired dose, you must first calculate the concentration of the reconstituted vial.
A Practical Example
Consider Researcher A, who has a 5mg (5,000mcg) vial of BPC-157. They add 2mL of Bacteriostatic Water to the vial. Their desired research dose is 250mcg.
Step 1: 5,000mcg ÷ 2mL = 2,500mcg per mL.
Step 2: (250mcg ÷ 2,500mcg/mL) × 100 = 10 Units.
The researcher knows they must draw the U-100 syringe to the "10" tick mark to administer exactly 250mcg of the peptide.