Reconstituting the 10 mg / 10 mg BPC-157, TB-500 vial in a single aqueous volume gives each peptide its own molar concentration—both sit at the same mg/mL, but because TB-500 is ~3.5× heavier than BPC-157 its molarity is correspondingly lower.
This is a concentration-math reference for the BPC-157, TB-500 blend, using a suitable solvent such as reconstitution solution (bacteriostatic water). Figures are in vitro stock concentrations, not quantities for any living system.
What concentration does each component reach?
For a 10 mg / 10 mg vial, both peptides share the reconstitution volume, so both reach the same mass concentration (mg/mL). Converting to molarity uses each peptide’s molecular weight (BPC-157 1419.5 g/mol; TB-500 4963 g/mol):
| Solvent added | Each at (mg/mL) | BPC-157 (mM) | TB-500 (mM) |
|---|---|---|---|
| 1 mL | 10.0 | 7.05 | 2.02 |
| 2 mL | 5.0 | 3.52 | 1.01 |
| 3 mL | 3.33 | 2.35 | 0.67 |
Worked example at 2 mL: 10 mg ÷ 2 mL = 5 mg/mL for each peptide. For BPC-157, 5 mg/mL ÷ 1419.5 g/mol = 3.52 mM. For TB-500, 5 mg/mL ÷ 4963 g/mol = 1.01 mM. The general method is in the concentration and reconstitution math guide.
Why do the two molarities differ at the same mg/mL?
Molarity is moles per litre, and moles depend on molecular weight. At an identical mass concentration, the lighter molecule (BPC-157) contributes more moles than the heavier one (TB-500). So although the label ratio is 1:1 by mass, the molar ratio in solution is roughly 3.5:1 in favour of BPC-157. Researchers normalising by molarity rather than mass should keep this in mind.
How is the reconstituted blend handled?
Standard peptide practice applies: add solvent down the vial wall, let the powder dissolve without vigorous agitation, and aliquot to limit freeze–thaw cycles. Earlier 5 mg / 5 mg lots halve every mass figure above at the same volume. See the single-compound pages for component-specific notes: BPC-157 and TB-500.
Related research guides
- BPC-157, TB-500 blend profile
- Concentration and reconstitution math guide
- Reconstitution solution (bacteriostatic water)
- TB-500 vs thymosin beta-4
Research-use note
All materials discussed are supplied for in vitro laboratory research use only, and are not for human or animal use.
