How to Read a TB-500 Certificate of Analysis
What KYIN Peptides' TB-500 certificate of analysis actually reports, and how to independently verify it.
What KYIN's TB-500 COA Reports
Every batch of KYIN's TB-500 is independently tested by Janoshik to 98.240% purity. As with every peptide in KYIN's catalogue, the certificate reports an HPLC purity result and a mass spectrometry identity confirmation. It's worth being precise about what "TB-500" refers to on a certificate: it is the synthetic fragment sold commercially, not the full-length 43-amino-acid Thymosin Beta-4 molecule studied by RegeneRx Biopharmaceuticals in human trials — the MS identity check confirms the sample matches the shorter fragment's expected molecular weight, not the full-length protein's.
Why Purity Below 99% Isn't Necessarily a Red Flag
TB-500's 98.240% purity result is slightly below the 99%+ results typical of shorter peptides like BPC-157, which is generally consistent with the greater synthesis complexity of a longer peptide sequence — more amino acid coupling steps create more opportunities for minor byproducts. A result in the high 90s with a clean, dominant HPLC peak and a matching MS identity confirmation is still a strong result; what matters most is that the certificate is batch-specific and independently verifiable, not the difference between, say, 98% and 99.5%.
How to Verify Independently
Janoshik publishes verifiable results at janoshik.com/verify using the batch number printed on the certificate. See our general How to Read a Certificate of Analysis guide for the fundamentals that apply across every compound in KYIN's catalogue.
TB-500 testing questions
What purity does KYIN Peptides' TB-500 meet?
KYIN Peptides' TB-500 is independently tested by Janoshik to 98.240% purity, with mass spectrometry identity confirmation of the synthetic fragment's expected molecular weight — see the current batch's certificate of analysis on the product page.
Is TB-500's slightly lower purity result a concern?
No — a purity result in the high 90s is normal for a longer synthetic peptide sequence and is not itself a red flag. What matters most is that the certificate is batch-specific, shows a clean dominant HPLC peak, and can be independently verified.
Interested in TB-500?
See pricing, current batch purity, and the full certificate of analysis on the product page.