What this does
A 10 mg BPC-157 vial in 2 mL of bacteriostatic water is 5 mg/mL. A 250 mcg draw is 0.05 mL, which is 5 units on a U-100 syringe. Set the unit explicitly: 1 mg = 1,000 mcg, and getting that backwards is a thousandfold error rather than a rounding one.
The vial size above is the one Peptriva ships, read from the live listing. Change it if yours differs. The dose stays whatever you set — this tool does not suggest one.
What size vial does BPC-157 come in?
The stocked vial is 10 mg. Five-milligram vials are common elsewhere in this market, which is why the per-milligram price is the only fair way to compare vendors and why the vial field above is editable.
The same vial at four water volumes:
| Water added | Concentration | Units for a 1 mg draw |
|---|---|---|
| 1 mL | 10 mg/mL | 10.0 units |
| 2 mL | 5 mg/mL | 20.0 units |
| 3 mL | 3.33333 mg/mL | 30.0 units |
| 5 mL | 2 mg/mL | 50.0 units |
Every row holds the same 10 mg. More water means a larger, easier-to-measure draw and a weaker solution. It does not stretch the vial.
What dose has actually been studied?
There is no established human dose, and that is the honest answer rather than an evasion. BPC-157 has three human pilot reports and none of them was dose-finding: an intra-articular case series in knee patients, a peri-vesical pilot in interstitial cystitis, and a 2025 intravenous safety pilot at 10 mg then 20 mg.
None of those used the subcutaneous route the research market sells. The BPC-157 dosage guide sets out what each study administered, and the knee case series takes the most-quoted one apart.
So the tool converts whatever you enter. It does not tell you what to enter, because nothing published would support the recommendation.
The trap on this one: micrograms
1 mg = 1,000 mcg. BPC-157 vials are labeled in milligrams and BPC-157 conversation happens in micrograms, so this is the single most common arithmetic failure on this compound.
Entering 250 when you meant 250 mcg, on a tool that assumes milligrams, asks for a draw a thousand times larger than intended. The unit selector above is an explicit choice for that reason, and switching it converts your number rather than reinterpreting it.
The second check worth doing is the size of the draw itself. At 10 mg in 2 mL a 250 mcg dose is 5 units, which is right at the edge of what a syringe reads reliably. More water pushes it into a comfortable range — the same dose from a 4 mL reconstitution is 10 units — because more water means a weaker solution and therefore a larger draw. It does not change how many doses the vial holds.
Frequently asked questions
How much bacteriostatic water for a 10 mg BPC-157 vial?
That is your choice, not a specification. 2 mL gives 5 mg/mL, 4 mL gives 2.5 mg/mL. The vial holds the same 10 mg either way. More water makes each draw larger and easier to measure accurately, which matters because BPC-157 doses are small: 250 mcg is 5 units at 2 mL and 10 units at 4 mL.
How many units is 250 mcg of BPC-157?
It depends on the concentration. At 10 mg in 2 mL, which is 5 mg/mL, 250 mcg is 0.05 mL, which is 5 units on a U-100 syringe. At 10 mg in 4 mL it would be 10 units.
What is the correct BPC-157 dose?
There is no established one. The three published human reports were not dose-finding studies and none used subcutaneous injection. This tool converts the dose you enter; it does not propose one.
Why does the unit selector matter?
Because 1 mg is 1,000 mcg and BPC-157 is labeled in one unit and discussed in the other. An unlabelled 250 could mean either, and the two answers differ by a factor of a thousand.
References
- American Society of Health-System Pharmacists (ASHP). Handbook on Injectable Drugs: Benzyl alcohol preservative compatibility and stability data. https://www.ashp.org/products-and-services/database-tools/handbook-on-injectable-drugs
- United States Pharmacopeia. (2024). Bacteriostatic Water for Injection — monograph and in-use stability guidance. USP-NF. (See institutional access.) https://doi.org/10.4135/9781412963855.n1200
- Wang, W. (1999). Instability, stabilization, and formulation of liquid protein pharmaceuticals. International Journal of Pharmaceutics, 185(2), 129–188. https://doi.org/10.1016/s0378-5173(99)00152-0
The arithmetic needs no citation; the diluent and stability guidance does.