August 29, 2026
RESEARCH USE ONLY. This page contains unit-conversion arithmetic only. It is not a dosing guide, not a protocol, and not a preparation or administration instruction for any person or animal. Products discussed on this site are supplied strictly for laboratory and research purposes.
Most pages answering this question treat the Wolverine Stack as a single 10 mg or 20 mg quantity and give you one concentration number. That is arithmetically wrong for a co-lyophilised blend, and the error matters. There are two peptides in the vial, and each has its own concentration once solvent is added.
The Wolverine Stack is sold in two sizes, and the product page states the composition explicitly: “Two peptides — BPC-157 and TB-500 — co-lyophilised into one vial at a 1:1 mass ratio.”
| Variant | BPC-157 | TB-500 | Total peptide mass |
|---|---|---|---|
| 5/5 MG | 5 mg | 5 mg | 10 mg |
| 10/10 MG | 10 mg | 10 mg | 20 mg |
Because the ratio is 1:1, both components always share the same concentration in solution. The number that changes is what a given volume contains of each.
| Bacteriostatic water added | BPC-157 | TB-500 | Combined peptide | Contained in 10 units* |
|---|---|---|---|---|
| 1 mL | 10 mg/mL | 10 mg/mL | 20 mg/mL | 1.0 mg + 1.0 mg |
| 2 mL | 5 mg/mL | 5 mg/mL | 10 mg/mL | 0.5 mg + 0.5 mg |
| 3 mL | 3.33 mg/mL | 3.33 mg/mL | 6.67 mg/mL | 0.333 mg + 0.333 mg |
| 5 mL | 2 mg/mL | 2 mg/mL | 4 mg/mL | 0.2 mg + 0.2 mg |
| Bacteriostatic water added | BPC-157 | TB-500 | Combined peptide | Contained in 10 units* |
|---|---|---|---|---|
| 1 mL | 5 mg/mL | 5 mg/mL | 10 mg/mL | 0.5 mg + 0.5 mg |
| 2 mL | 2.5 mg/mL | 2.5 mg/mL | 5 mg/mL | 0.25 mg + 0.25 mg |
| 3 mL | 1.67 mg/mL | 1.67 mg/mL | 3.33 mg/mL | 0.167 mg + 0.167 mg |
| 5 mL | 1 mg/mL | 1 mg/mL | 2 mg/mL | 0.1 mg + 0.1 mg |
*See the syringe note below before reading the last column.
An insulin syringe is graduated in units, which are a volume marking, not a mass. On both U-100 and U-50 insulin syringes, one unit corresponds to 0.01 mL. The difference between them is barrel capacity and how widely spaced the gradations are — not the unit-to-volume relationship. A U-50 syringe holds 0.5 mL across 50 units; a U-100 holds 1.0 mL across 100 units. Both are 100 units per millilitre.
So the mass contained in any number of units is simply:
mass = (peptide mg ÷ mL of solvent added) × (units × 0.01)
Worked from the table above: a 10/10 MG vial reconstituted with 2 mL gives 5 mg/mL of each component. Twenty units is 0.2 mL. 0.2 mL × 5 mg/mL = 1.0 mg of BPC-157 and 1.0 mg of TB-500.
Our reconstitution calculator runs this arithmetic across a 44-compound library if you would rather not do it by hand.
Nothing above tells you what volume to use. The volume determines only how the fixed mass in the vial is distributed across the solution — it does not change how much peptide you have. Larger volumes make small quantities easier to measure accurately against the syringe gradations; smaller volumes concentrate the same mass into less liquid. That is the entire trade-off, and it is a measurement question.
Sourced fact: The Bacteriostatic Water for Injection label directs: “Do not store reconstituted solutions of drugs for injection unless otherwise directed by the manufacturer of the solute.” [1]
Inference: The widely-quoted 28-day figure describes the multiple-dose container of water, not what you dissolved in it. Those are different questions with different answers, and conflating them is the most common error in this topic. We traced the 28-day rule to its actual source — it is not printed on the FDA label at all — in where the 28-day rule actually comes from.
This is unit-conversion arithmetic for laboratory research planning. It is not medical or veterinary advice, not a protocol, not a recommendation of any volume, and not an instruction to administer anything to any person or animal. The compounds referenced are not approved by the FDA for human or veterinary use.
Reconstitution arithmetic for every compound in the catalogue: BPC-157 · TB-500 · Wolverine Stack · GLOW · KLOW · CJC-1295 / Ipamorelin · Ipamorelin · CJC-1295 No DAC · GHK-Cu · Epitalon · MOTS-c · AOD-9604 · NAD+ · PT-141 · Tesamorelin · Retatrutide · Tirzepatide · SS-31 · Selank · Semax · KPV · DSIP · PEG-MGF · FOXO4-DRI · ARA-290 · 5-Amino-1MQ
Wolverine Stack (BPC-157 / TB-500) · Bacteriostatic Water, USP · Reconstitution calculator · Reconstitution handling guide
One thing worth knowing before you compare vendors: no published study has tested BPC-157 and TB-500 as a combination. The evidence base covers each peptide separately. We state that on the product page rather than implying the blend has been studied as such.
RESEARCH USE ONLY — FULL DISCLAIMER. The products discussed on this page are supplied strictly for laboratory and scientific research purposes. They are not for human or veterinary use, and not for consumption. These statements have not been evaluated by the Food and Drug Administration. Nothing on this page is intended to diagnose, treat, cure, or prevent any disease in humans or animals. Nothing here constitutes medical or veterinary advice or a dosing, preparation, or administration recommendation for any person or animal.
