BPC-157 vs TB-500: Comparing Two Common Laboratory Reference Peptides
BPC-157 and TB-500 are the two most frequently ordered reference peptides in laboratory catalogues. They are chemically unrelated, and the practical differences matter more for handling and analysis than most product pages suggest.
Sequence origin and structure
BPC-157 is a synthetic pentadecapeptide — fifteen residues — derived from a sequence identified in gastric protein. TB-500 is the acetate salt of a short synthetic fragment of thymosin beta-4, a naturally occurring actin-binding protein. They share no sequence homology.
Stability and handling differences
Both are supplied lyophilized and both are stable at −20 °C, but TB-500 is more sensitive to oxidative conditions and benefits from nitrogen-sealed vials. BPC-157 tolerates a wider pH range in solution, which makes buffer selection less restrictive during method development.
Analytical considerations
The longer BPC-157 chain produces more opportunity for deletion sequences during synthesis, so the HPLC chromatogram deserves close attention around the main peak. TB-500's shorter sequence typically yields a cleaner profile, but counter-ion content should be checked, since acetate contributes meaningfully to vial mass at small fill weights.
Documentation to expect for either compound
Whichever you order, the certificate of analysis should carry the batch reference, the HPLC chromatogram, an MS trace confirming molecular weight, peptide content, water content and residual solvents — issued by a named independent laboratory.
Frequently asked questions
Short answers to the questions laboratories ask most often about this topic.
Are BPC-157 and TB-500 chemically related?
No. BPC-157 is a fifteen-residue synthetic peptide; TB-500 is a short synthetic fragment of thymosin beta-4 supplied as an acetate salt. They share no sequence homology.
Which is more stable in solution?
BPC-157 tolerates a broader pH range, while TB-500 is more sensitive to oxidation and benefits from inert-atmosphere storage and prompt aliquoting.
Are BPC-157 and TB-500 the same class of compound?
No. BPC-157 is a synthetic pentadecapeptide sequence, while TB-500 is a fragment of the thymosin beta-4 protein — different origins and different molecular sizes.
Which is more stable in storage?
Both are stable lyophilized at −20 °C. In solution, shorter sequences like BPC-157 generally tolerate handling slightly better than larger fragments.
Do they require different analytical methods?
Both are released by reverse-phase HPLC with mass-spectrometry identity confirmation; the gradient and column conditions differ with molecular size.
Can they be studied side by side?
Comparative in-vitro work is common, but purity, counter-ion content, and reconstitution solvent must be matched or the comparison is confounded.
Peptides supplied with lot-specific analysis
Every PureLabs batch ships with an independent HPLC and mass-spectrometry certificate tied to the reference printed on your vial.