Understand the source comparison
How Many Units of Peptides: mg vs mL vs mcg vs Units Explained
The biggest source of confusion about how many units of peptides to use is the multiple measurement systems involved: Milligrams (mg) = mass/weight of the peptide. The vial label says “5mg” — this is how much peptide powder is in the vial before reconstitution
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- The biggest source of confusion about how many units of peptides to use is the multiple measurement systems involved:
- Milligrams (mg) = mass/weight of the peptide. The vial label says “5mg” — this is how much peptide powder is in the vial before reconstitution. This number NEVER changes regardless of how much water you add.
- Micrograms (mcg) = a smaller mass unit. 1mg = 1,000mcg. Peptide doses are often listed in micrograms (e.g., “250mcg BPC-157”). When calculating how many units of peptides to draw, you must convert mcg to mg: 250mcg = 0.25mg.
- Milliliters (mL) = volume of liquid. This is how much bacteriostatic water you add. On a U-100 syringe, 1mL = 100 units.
- Units = the markings on the syringe barrel. On U-100 syringes, 100 units = 1mL. How many units of peptides you draw is the final output — the number that tells you where to fill the syringe.