DEMO=0 python3 build.py after wiring real content.Thymosin Beta-4 fragment — frequently mislabelled or substituted.
TB-500 is routinely substituted with cheaper fragments because the label is hard to check. LC-MS resolves the actual sequence mass, so a substitution shows up immediately even when the purity number looks perfect.
Confirms the molecule is what the label claims, by measuring the mass of the eluting ions. Catches substitution and the wrong compound entirely.
How much is actually in the vial, compared against the declared strength and reported as a percentage of claim.
Area percent of the main peak, with the chromatogram attached so the figure can be checked rather than trusted.
A report ID and unique key that resolve to a public record. Anything that does not resolve is not a genuine report.
| Target compound | TB-500 (Thymosin Beta-4 fragment) |
|---|---|
| Other names | Tβ4 fragment, TB4 |
| Testing method | RP-HPLC-UV 214 nm + ESI-LC-MS |
| Result format | mg per vial, purity %, identity confirmed |
| Minimum sample | 1 whole unopened vial, or 20 mg raw API |
Yes — the mass difference is unambiguous by LC-MS.
Add any of these to the same vial, on the same certificate.
Describe the sample and we will tell you what to order — or whether we can test it at all.