Worked example
Add 2 mL of water to a vial holding 5 mg of BPC-157. The concentration is 5 ÷ 2 = 2.5 mg/mL, or 2,500 mcg in every millilitre. On a U-100 syringe, where 100 units make 1 mL, each unit holds 25 mcg and each 10 units hold 250 mcg.
Change the water and only the concentration changes. With 4 mL instead, each 10 units hold 125 mcg, half as much, and any given mass takes twice the units to measure. These numbers illustrate the arithmetic; they are not amounts to use.
Concentration table
Per-component concentration for the label split above. Each component is diluted by the same water volume. The last column is what 10 units on a U-100 syringe hold.
| Vial | Water | Concentration | 10 units (U-100) hold |
|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 500 mcg |
| 5 mg | 2 mL | 2.5 mg/mL | 250 mcg |
| 5 mg | 3 mL | 1.667 mg/mL | 166.7 mcg |
Notes for BPC + TB blend vial math
- Total vial mass is not what matters for a blend. A "10 mg" vial labeled 5 mg + 5 mg holds 5 mg of each. Enter the components separately; the calculator adds them up.
- Because both components share the same volume, their ratio in every draw is the label ratio. You cannot measure one without the other.
- The split on the label is the seller's claim. Independent testing of blends is rarer than for single peptides, and a COA that reports one combined purity number does not confirm the split.
Storage and handling
- No stability data exists for these blends after reconstitution. Mixing peptides can change stability in ways neither component's data predicts.
- Keep reconstituted vials refrigerated (2-8 °C), unfrozen, out of light, and labeled with date and per-component concentration.