Lab tools

Peptide identity index

The peptide identity index tells you whether two names used for research peptides refer to the same molecule. Look up a catalog name, a CAS number, or an alias. Compare a second name when a vial, a paper, or a COA uses a different label.

Mass values computed from sequence are for checking an HPLC-MS report. This page does not calculate reconstitution volumes or human doses. Pair it with a lot-linked Certificate of Analysis and the 12-point COA audit.

Compound A

BPC-157 + TB-500 blend

137525-51-0

Compound B

BPC-157

137525-51-0

Observed mass from a COA

Not the same molecule

A single sequence versus two peptides in one vial.

Mixture

BPC-157 + TB-500 blend

View specs

CAS: 137525-51-0
Formula: C62H98N16O22 | C212H350N56O78S
Catalog mass: See component peptides
Sequence avg: Not computed
Monoisotopic: Not computed
Sequence: Multi-component: see BPC-157 and TB-500

No sequence-derived ions for this entry. Compare the catalog mass to the COA report.

COA documents PubChem CAS search

Often confused with

BPC-157

Peptide

BPC-157

View specs

CAS: 137525-51-0
Formula: C62H98N16O22
Catalog mass: 1,419.53 Da
Sequence avg: 1,419.55 Da
Monoisotopic: 1,418.7042 Da
Sequence: Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val

Expected ions

[M+H]+

1,419.7115

[M+2H]2+

710.3594

[M+3H]3+

473.9087

Presentations

Capsules

COA documents PubChem CID 9941957

Often confused with

How the index decides

Catalog CAS, formula, and sequence come from Tetrava lot identity tables. Monoisotopic mass and expected ions are calculated only when the sequence parses as standard residues plus common caps (acetyl, amide, Aib, Nle, pGlu). Heavily modified GLP-1 analogs stay as catalog text.

TB-500 is the main trap. Supplier tables often reuse the CAS and 4,963 Da mass of full-length thymosin beta-4 on a vial whose sequence is Ac-LKKTETQ. This index splits those identities on purpose.

Research use only. Not for human or veterinary consumption.