BPC-157 explained: sequence, CAS and certificates

BPC-157 is the most searched-for substance in this catalogue. This article gathers what can be documented about it: the sequence, the mass, the identification number and the six certificates of analysis held in the library. What it does in an organism is not covered here. That is a matter for ongoing research, not for a supplier.

Fifteen amino acids in a fixed order

BPC-157 is a pentadecapeptide: a chain of fifteen amino acids. The sequence is Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val, and it defines the molecule completely. Two preparations with this order are the same substance, whoever made them.

The molecular formula is C₆₂H₉₈N₁₆O₂₂, the molar mass 1419.55 g/mol and the CAS number 137525-51-0. These four details appear on the product page and should match every certificate supplied for a lot.

The proline content stands out: three proline residues sit directly in a row. Proline is the only one of the twenty standard amino acids with a ring, which makes the chain rigid at that point. In solid-phase synthesis this is exactly the difficult spot, because the next coupling step works less well on a rigid chain than on a flexible one.

Where the sequence comes from

The order is taken from a stomach protein, not invented. BPC-157 is therefore a fragment of a naturally occurring chain, rebuilt synthetically. TB-500 follows the same principle: it is a section of thymosin beta 4. How the two differ chemically is set out in TB-500 explained.

It is supplied as a lyophilised powder. What lyophilisation does to the material, and why the shape of the cake in the vial says nothing about the weighed mass, is covered in Storing lyophilised peptides in the laboratory.

Six certificates, five of them for the smaller vial size

The certificate library holds six analytical reports for this substance. Five come from 5 mg lots and one from a 10 mg lot, the size sold here. The product page lists every certificate for the substance with the vial size of its lot: a certificate applies to the lot it comes from, not to a different fill size.

All six reports give a numerical purity figure. The five from 5 mg lots range from 97.6% to 98.33%, and the one from the 10 mg lot gives 99.864%.

97.6%, and what it means

The lowest measured values are 97.6% and 97.8%. This shop states no blanket minimum purity; what counts is the measured value in the report for each lot. All of them sit in the library for anyone to read.

The difference between the two is not a play on words. A specification is a commitment about the product; a measured value belongs to a single lot and is determined by a laboratory on a particular day. A supplier whose library contains no figure below its own promise is either publishing very few reports or not all of them.

Anyone who wants to check can find the reports in the library without an account. What to look for (the method beside the value, the lot number, the date, the laboratory) is explained in How to read a certificate of analysis.

Why the chain length makes analysis easy

Fifteen residues mean fourteen coupling steps. That is few, and the share of incomplete chains that purification has to remove is correspondingly modest. For the long molecules in this catalogue, such as retatrutide at around four thousand seven hundred grams per mole, the effort is many times greater.

Mass spectrometry also has an easy time with a defined chain of this size: the expected mass is unambiguous, and any deviation shows up at once. Purity should not be confused with peptide content, which is regularly lower because of salts and residual moisture.

Which blends also contain it

BPC-157 is a component of three research blends: GLOW 70 (BPC-157, GHK-Cu and TB-500), KLOW 80 mg (BPC-157, TB-500, GHK-Cu and KPV) and BPC-157 + TB-500. For blends the specification applies per component, and a blend has no shared purity figure; the certificate library holds one report for a blend, the BPC-157 + TB-500 lot 237179, which gives no numerical purity figure. More on this in Research blends and their certificates.

Before reconstitution

The material goes into solution with bacteriostatic water. The concentration follows from the vial mass and the volume of solvent; the laboratory steps are described under reconstitution.

In brief

Fifteen amino acids, 1419.55 g/mol, CAS 137525-51-0, six analytical reports in the library, five from 5 mg lots with measured values between 97.6% and 98.33%, and one from a 10 mg lot at 99.864%. That is the documented part. Everything else said about this substance belongs in the scientific literature, not on the page of a chemicals supplier.

Questions

How many amino acids does BPC-157 have?

Fifteen. The full sequence is in the specification table on the product page, together with the molecular formula, molar mass and CAS number.

Why are most of the certificates for 5 mg when the product is 10 mg?

Because an analytical report belongs to the lot it comes from. Five of the six reports come from 5 mg lots and one from a 10 mg lot; the product page lists each certificate with the vial size of its lot.

Why does the library include lower purity figures?

There is no blanket minimum; a measured value belongs to a single lot. The lowest values are 97.6% and 97.8%. All six reports can be viewed in the library, and none has been removed.