Per-compound reconstitution
Each compound is calculated on its own — different vials, different concentrations, different draws. Use these references, then run your exact numbers on each compound's calculator.
BPC-157 reference
U100 units to draw for each common BPC-157 dose, by vial size, reconstituted with 2 mL of bacteriostatic water. Change the water volume in the calculator above to recompute for your own setup.
| Vial | Concentration | 200 mcg | 250 mcg | 500 mcg |
|---|---|---|---|---|
| 5 mg | 2.5 mg/mL | 8 u(0.08 mL) | 10 u(0.1 mL) | 20 u(0.2 mL) |
| 10 mg | 5 mg/mL | 4 u(0.04 mL) | 5 u(0.05 mL) | 10 u(0.1 mL) |
Educational reference only — not a dose recommendation. Units assume a U100 insulin syringe (100 units = 1 mL on U-100). Always confirm against your own vial, diluent, and clinician or pharmacy instructions.
GHK-Cu reference
U100 units to draw for each common GHK-Cu dose, by vial size, reconstituted with 5 mL of bacteriostatic water. Change the water volume in the calculator above to recompute for your own setup.
| Vial | Concentration | 1 mg | 2 mg |
|---|---|---|---|
| 50 mg | 10 mg/mL | 10 u(0.1 mL) | 20 u(0.2 mL) |
| 100 mg | 20 mg/mL | 5 u(0.05 mL) | 10 u(0.1 mL) |
Educational reference only — not a dose recommendation. Units assume a U100 insulin syringe (100 units = 1 mL on U-100). Always confirm against your own vial, diluent, and clinician or pharmacy instructions.
Different vial sizes, different draws
GHK-Cu vials are much larger than BPC-157 vials, so they are usually reconstituted with more bacteriostatic water (often 3–10 mL) to keep the concentration workable. BPC-157 stays in the small 5–10 mg range. The result is two very different unit counts on the syringe even when the protocol feels balanced — which is exactly why each compound needs its own calculation.
- GHK-Cu: 50–100 mg vials, more diluent, larger total volume
- BPC-157: 5–10 mg vials, small draws
- Never assume the two share a concentration
Injectable vs topical GHK-Cu in a stack
GHK-Cu is also widely used topically, where it is pre-formulated as a percentage strength rather than mg/mL. If your GHK-Cu is a topical product, it is not part of this reconstitution math at all — only an injectable, lyophilised GHK-Cu vial uses the calculator. BPC-157 is calculated the same way regardless.
- Topical GHK-Cu uses % strength, not mg/mL — not calculated here
- Only a lyophilised GHK-Cu vial is reconstituted with BAC water
- BPC-157 math is unchanged whether GHK-Cu is topical or injectable
Frequently asked questions
Why is the GHK-Cu draw so different from BPC-157?+
Can I run BPC-157 and GHK-Cu at the same time?+
Is GHK-Cu measured the same way as BPC-157?+
Primary sources
Full reference list- 1Stable gastric pentadecapeptide BPC 157 and wound healingPubMed / Frontiers in Pharmacology · 2018
- 2Brain-gut axis and pentadecapeptide BPC 157PubMed / Current Pharmaceutical Design · 2016
- 3
- 4Handling and Storage Guidelines for PeptidesBachem · 2024