The BPC157 CAS number is commonly listed as 137525-51-0. For a research purchaser, that number is a useful starting point for catalog searches and documentation review, but it is not a stand-alone confirmation that a vial contains the intended peptide. Reliable material identification requires the CAS Registry Number to agree with the peptide sequence, molecular formula, expected mass, and batch-specific analytical records.
What Is the BPC157 CAS Number?
A CAS Registry Number, often shortened to CAS number or CAS RN, is a numerical identifier assigned to a chemical substance in the Chemical Abstracts Service registry. It is designed to distinguish a substance from others with similar names, abbreviations, or structural descriptions.
For BPC-157, the widely used identifier is CAS 137525-51-0. The number is formatted in three sections separated by hyphens. Its final digit is a checksum, which helps identify transcription errors. That formatting feature is useful for database handling, but it does not evaluate the quality, composition, or analytical status of a supplied research material.
BPC-157 is commonly described as a synthetic peptide with the sequence:
Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val
Its one-letter sequence is GEPPPGKPADDAGLV. This sequence is often more informative than a short product name because peptide identity depends on residue order, terminal chemistry, mass, and related structural details.
BPC157 CAS Number: Key Identity Data
The following identifiers should be reviewed together when evaluating BPC-157 documentation.
| Identifier | Commonly reported information | |—|—| | CAS Registry Number | 137525-51-0 | | Peptide sequence | GEPPPGKPADDAGLV | | Amino acid length | 15 residues | | Molecular formula | C62H98N16O22 | | Approximate molecular weight | 1419.53 g/mol | | Material class | Synthetic peptide |
These values provide a coherent identity profile. A catalog page that displays only a CAS number leaves several questions unanswered, including whether the sequence is stated, whether the mass aligns with the stated form, and whether the lot has been analytically characterized.
Why a CAS Number Is Not a Purity Certificate
A CAS number identifies a registered substance. It does not communicate chromatographic purity, peptide content, residual solvent profile, water content, counterion composition, or the presence of sequence-related impurities. Those attributes can vary by lot and by production process.
This distinction matters especially with peptides. A material may be associated with the correct CAS number while still requiring review for deletion sequences, truncated products, oxidation products, aggregation, or process-related residuals. The CAS number belongs in an identity check, not in place of one.
For research organizations, the practical question is not merely, “Does this product have the expected number?” It is, “Does the full documentation package support the identity and quality attributes needed for this specific workflow?” The answer depends on the study design, analytical sensitivity requirements, and internal purchasing standards.
How to Verify BPC-157 Material Identity
A disciplined review begins before an order is placed and continues when batch documents are available. Product naming conventions vary between suppliers, so researchers should compare primary identity fields rather than relying on title wording alone.
First, compare the listed CAS 137525-51-0 with the declared 15-residue sequence. The sequence should be presented in either three-letter amino acid notation or the one-letter format GEPPPGKPADDAGLV. If a supplier provides a different sequence, molecular formula, or molecular mass, request clarification before entering the material into a research inventory.
Next, review molecular mass data. For a peptide of this size, mass spectrometry is commonly used to confirm that the principal observed mass is consistent with the expected molecular species. The reported result should be understandable in context: mass spectrometry may display multiple charge states, adducts, and instrument-specific conventions. A credible document identifies the method and gives enough information to connect the observed result to the stated peptide.
Reverse-phase HPLC is another central identity and quality-control tool. An HPLC chromatogram can show the principal peak profile and support a stated purity result under the specified method. It should not be read as a universal measure of every possible impurity. Method details such as column chemistry, detection wavelength, gradient, and integration approach affect the outcome, which is why a chromatogram is most useful when paired with a clear certificate of analysis or lot record.
The final review is batch matching. The lot number on the label, shipping documentation, and analytical report should agree. An otherwise polished report is of limited value if it cannot be traced to the specific material received. Laboratory managers can reduce errors by recording the supplier lot number, receipt date, storage condition, and document version in their inventory system.
Naming Variations Can Create Search Errors
BPC-157 may appear in supplier catalogs and research notes under several variations, including BPC 157, BPC157, Body Protection Compound-157, or the full peptide sequence. These naming differences make the CAS number helpful for search normalization, but they also create a risk of false confidence.
For example, a search result may associate the correct CAS number with a generic peptide entry while omitting information about salt form, lyophilized presentation, net peptide content, or lot-specific purity. Those details can affect how a laboratory classifies, compares, and documents materials. A purchasing record should preserve the exact supplier description rather than replacing it with a shorthand name alone.
Researchers should also avoid treating a product label as a chemical structure assignment. Labels are operational identifiers. Structure confirmation comes from a combination of sequence declaration, expected mass, analytical data, and traceable manufacturing or testing records.
Documentation That Supports Research Purchasing
For a research peptide such as BPC-157, useful supplier documentation generally connects the product identity to a specific lot and analytical method. At minimum, qualified purchasers often look for a lot number, stated sequence, reported molecular mass, chromatographic purity result, test date, and clear issuer information.
More demanding workflows may require additional review of method suitability, impurity characterization, elemental analysis, moisture content, residual solvents, or stability-related observations. There is no single document set that fits every laboratory. Exploratory analytical work may prioritize identity confirmation and traceability, while a method-validation project may require much deeper technical detail.
Biotech Labz Supply positions research materials around documented identity and analytical review. When comparing research peptide listings, focus on whether the available information allows your laboratory to make a defensible purchasing decision, not simply whether the listing repeats a familiar CAS number.
Frequently Asked Questions
Is 137525-51-0 the CAS number for BPC-157?
Yes. 137525-51-0 is the commonly listed CAS Registry Number for BPC-157. It should be cross-checked against the declared sequence, formula, molecular mass, and lot-specific records.
What is the BPC-157 sequence?
The peptide sequence is GEPPPGKPADDAGLV, representing 15 amino acid residues. Sequence information is a primary identity field and is more specific than a marketing or catalog abbreviation.
Does the BPC157 CAS number prove the material is pure?
No. A CAS number identifies the substance associated with a registry entry. It does not establish purity, composition, or the quality of a particular lot. HPLC and mass spectrometry records provide more relevant evidence for those questions.
Why should the lot number match the analytical report?
Matching lot numbers creates traceability between the physical material and its documentation. Without that connection, analytical results cannot be confidently assigned to the item received by the laboratory.
When BPC-157 is being evaluated for a research workflow, treat CAS 137525-51-0 as the first checkpoint, then let sequence confirmation, mass data, chromatographic evidence, and lot traceability carry the decision forward.
