TB-500 (Thymosin Beta-4) doesn't ship as a standalone research item from V8 Peptides — it's supplied as one half of a combination stack — but the sourcing standards a researcher should apply are the same as for any peptide reagent: does the paperwork actually prove what's in the vial, and does it match the sequence and purity the study calls for? Those questions matter more for TB-500 than for many compounds, precisely because it is almost never purchased on its own.
What to check before buying TB-500 (Thymosin Beta-4)
- Measured purity, not a marketing claim — a stated HPLC purity value (e.g. ≥98%) with the analytical method identified, not a bare percentage with no supporting data.
- Confirmed identity — mass spectrometry data showing the measured mass matches the expected TB-500 sequence, not just an assumed match based on the label.
- Lot-specific documentation — a Certificate of Analysis tied to the exact batch in hand, not a generic reference document reused across every listing.
- Independent verification — third-party lab testing that corroborates the supplier's in-house results, rather than a single internal test standing alone.
- Honest, research-only framing — clear labeling and storage guidance, with no therapeutic language anywhere on the listing.
- Appropriate shipping and handling — reliable, discreet delivery that accounts for the peptide's cold-chain sensitivity.
Why TB-500 is sold as part of a stack
TB-500 and BPC-157 are studied together often enough — for the reasons discussed in BPC-157 vs. TB-500 — that most researchers requesting TB-500 are already running a combination protocol. Supplying the two together as a single stack keeps sourcing, documentation, and reconstitution timing consistent across both compounds in a study, which removes one more variable from an already multi-variable experimental design.
Where to find documented TB-500
V8 Peptides supplies TB-500 as part of the BPC-157 + TB-500 research stack, with each peptide verified to ≥98% HPLC purity and a batch-specific Certificate of Analysis included with every order, shipped domestically via USPS. For a broader framework on evaluating any peptide vendor, see the supplier checklist.
Research Use Only. Supplied strictly for laboratory research and development — not for human or veterinary use, consumption, or any therapeutic or diagnostic purpose. This article is research education, not usage guidance.