By BioLabs Research · Last reviewed: October 28, 2026
A BPC-157 / TB-500 blend is two peptides in one vial, not a new substance. BPC-157 is a 15-residue gastric-derived fragment with its own CAS and mass. The TB-500 listing on this site is an N-acetyl LKKTETQ fragment (not intact thymosin beta-4) with its own CAS. Mixing them does not mint a third CAS. If the lot paper shows one sequence, it has not identified the SKU.
This note is identity for laboratory purchasing. It does not sell a cytoskeleton stack, a ratio, or a clinical protocol. HPLC area% is still not net peptide content, and we will not invent either number for a blend.
BPC-157 identity
BPC-157 is the pentadecapeptide GEPPPGKPADDAGLV (H-Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val-OH). Public listings use CAS 137525-51-0, formula C62H98N16O22, and a nominal mass of about 1419.5 Da. That is one molecule. Longer “BPC” proteins from gastric juice are not this 15-mer. C-terminal amides, if a vendor ships them, are a different mass and must be stated.
| Field | BPC-157 (this catalog’s identity) |
|---|---|
| CAS | 137525-51-0 |
| Sequence | GEPPPGKPADDAGLV |
| Formula | C62H98N16O22 |
| Nominal MW | ~1419.5 Da |
Longer site note: What Is BPC-157? Peptide Identity and Research Context. This blend article does not replace that page. It exists because the SKU is two names on one vial. For sequence, CAS and COA checks, see our BPC-157 peptide identity guide.
TB-500 listing identity
TB-500 on this site is a catalog name for a thymosin-beta-4 fragment listing, commonly Ac-LKKTETQ, CAS 885340-09-2. That is not full-length thymosin beta-4 (43 residues). It is not thymosin alpha-1 (the 28-residue N-acetyl peptide). If a COA prints intact T-beta-4 mass against a TB-500 PO, the lot is the wrong length.
| Field | TB-500 listing (this site) |
|---|---|
| CAS (fragment listing) | 885340-09-2 |
| Sequence (as listed) | Ac-LKKTETQ fragment (not full Tβ4) |
| Not this component | Intact thymosin β4; thymosin α1 / thymalfasin |
See What Is TB-500? and the identity note that unmixes the other thymosin name: thymosin alpha-1 is not TB-500.
A blend is not a third CAS
CAS numbers index single substances (or defined salts), not storefront mix names. There is no legitimate third registry number that means “BPC-157 plus TB-500.” A vendor who invents one, or who prints only one of the two CAS numbers on a blend label, has not described the vial. The correct label is two CAS numbers, two sequences, two masses.
Contrast with trade-name blends that never name the components — those listings have no CAS at all until lot docs list molecules. This SKU does name both molecules. That is the difference. The unnamed-blend problem is discussed in the ECM-70 identity note.
Lot paper must show both
A usable COA for this SKU reports:
- BPC-157 sequence GEPPPGKPADDAGLV, theoretical ~1419.5 Da, observed mass.
- TB-500 fragment sequence as actually synthesized (Ac-LKKTETQ if that is the listing), theoretical mass for that fragment, observed mass.
- HPLC that can be read for each named peak, with method ID.
- Component amounts only if measured for that lot — never a blog ratio.
Two peaks with one unlabeled chromatogram is not enough. Two masses with one sequence line is not enough. If only BPC-157 is on the paper, you were sold a BPC-157 lot in a blend carton, or the paperwork is incomplete. Either way, do not start the experiment.
No HPLC percentage and no ratio
HPLC area% is a UV ratio under one method, not milligrams of either peptide. A blend makes that confusion worse: two main peaks, two area%, still no net peptide content. We will not print a house purity for this SKU. Read HPLC area percent vs net peptide content before treating any percentage on a blend COA as a weighing factor.
Mix ratio is lot data. This article does not invent 5 mg / 5 mg, 10/10, or any other pair. If the COA is silent on amounts, request it. If the COA is silent on both masses, it is not a blend COA.
Catalog card
The BPC-157 / TB-500 blend catalog page is two named reagents, RUO, with a published Lab COA. Match both CAS lines to the lot paper. Related singles: BPC-157 and TB-500.
The harder you work for something, the greater you'll feel when you achieve it.
BPC-157 / TB-500 blend listing
Two sequences, two masses, no third CAS. Research use only. Lot paper must show both. No ratio invented here.
Related notes
References
- BPC-157 public identity as used on this catalog: CAS 137525-51-0, sequence GEPPPGKPADDAGLV, formula C62H98N16O22, nominal mass ~1419.5 Da. Confirm against the lot docs. Related note: https://blrcommerce.io/blog/what-is-bpc-157
- TB-500 fragment listing on this site: CAS 885340-09-2, Ac-LKKTETQ fragment (not intact thymosin beta-4). Related note: https://blrcommerce.io/blog/what-is-tb-500
- On reading area% versus milligrams of peptide: HPLC area percent is not net peptide content.
Research use only. Not for human consumption, self-administration, or therapeutic use. Laboratory reagent listing only.