Tool
TB-500 (TB4) reconstitution calculator
TB-500 (TB4) ships as a 5 mg vial of lyophilized powder. Pick the size, type the water volume, read the concentration. The molecular weight is already filled in, so the molar result is there too.
- Concentration
- 2.5 mg/mL
- 2.5 µg/µL · 2500 µg/mL
- Molar
- 0.504 mM
- 503.7 µM
Concentration = peptide mass ÷ diluent volume. Molarity = (mg/mL ÷ g/mol) × 1000. Research use only.
TB-500 (TB4) at common volumes
| Vial | 1 mL | 2 mL | 3 mL | 5 mL |
|---|---|---|---|---|
| 5 mg | 5 mg/mL1.01 mM | 2.5 mg/mL0.504 mM | 1.67 mg/mL0.336 mM | 1 mg/mL0.201 mM |
TB-500 (TB4) vial sizes we sell, at four diluent volumes. Molarity uses 4963.44 g/mol. Other volumes
What the numbers mean for TB-500 (TB4)
TB-500 (TB4) has a molecular weight of 4963.44 g/mol (C212H350N56O78S). So 5 mg is about 1.01 micromoles, whatever volume you dissolve it in. At 2.5 mg/mL that is 0.504 mM.
The vial holds 5 mg of powder and no diluent. Add bacteriostatic water down the inside of the glass, swirl, and do not shake. The reconstitution guide covers the handling; this page covers the arithmetic.
Common questions
How much water do I add to a 5 mg vial of TB-500 (TB4)?+
Any volume that gives a concentration you can measure easily. 1 mL gives 5 mg/mL, 2 mL gives 2.5 mg/mL, 5 mL gives 1 mg/mL. The peptide amount stays 5 mg whatever you add.
What is the concentration of TB-500 (TB4) 5 mg in 2 mL?+
2.5 mg/mL, which is the same as 2.5 µg/µL. With a molecular weight of 4963.44 g/mol that is 0.504 mM.
Where does the TB-500 (TB4) molecular weight come from?+
The reference value on the product's Specifications tab, 4963.44 g/mol. The observed mass for the vial you receive is on its own lab report, which the QR code on the vial opens.
Related pages
- Buy TB-500 (TB4)5 mg. Free shipping, same-day dispatch, report on the vial.
- TB-500 handling guideTB-500's numbers in one place: mass, its relationship to thymosin beta-4, vial size, concentration table and what its report should show.
- TB-500 vs TB-500 fragment 17-23A 43-residue peptide and the seven residues inside it that do the actin binding. Masses, and why the fragment weighs a seventh as much.
- BPC-157 vs TB-500: what's the difference?BPC-157 and TB-500 are two distinct research peptides studied in tissue-repair models. Here's how they differ by sequence, size, and research context - and how to verify either.
- Calculator for any peptideType your own mass and molecular weight.
- Reconstitution and storage guidesThe handling around the numbers.
Research use only. Not for human or animal consumption.