This article covers the chemistry, analysis and handling of BPC-157 as a laboratory material. It does not cover biological findings. PepXtide supplies this material for laboratory research use only; not for human consumption.
Chemical identity
BPC-157 is a synthetic linear peptide of 15 residues with the sequence Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val (GEPPPGKPADDAGLV). The composition is three glycine, four proline, two alanine, two aspartic acid, and one each of glutamic acid, lysine, leucine and valine. Summing the residue formulas and adding one water gives a molecular formula of C62H98N16O22.
The calculated monoisotopic mass is about 1418.70 Da, and the average molecular weight is about 1419.5 g/mol. In positive-mode electrospray the expected ions are [M+H]+ near m/z 1419.71, [M+2H]2+ near m/z 710.36 and [M+3H]3+ near m/z 473.91. The sequence has no cysteine, methionine or tryptophan, so it lacks the residues most prone to disulfide formation or oxidation. It does have four prolines, which affect chromatographic behaviour and fragmentation.
Where the sequence comes from
In the literature the sequence is described as a partial sequence of a larger protein reported in gastric juice. The material handled at the bench is not extracted from that source. It is made by solid-phase peptide synthesis, so its impurity profile reflects synthetic chemistry: deletion sequences, truncated chains, and residual protecting-group or cleavage by-products. Those are the species an analytical method has to distinguish from the target.
How identity is confirmed on a certificate
A certificate for this material normally rests on two orthogonal measurements. The first is reversed-phase HPLC with UV detection, typically at 214 or 220 nm, where the peptide bond absorbs. Identity by HPLC means the main peak's retention time matches that of a reference standard run under the same column, gradient and temperature. A retention match alone does not prove structure, since co-eluting species are possible, so it is paired with mass spectrometry.
The second measurement is mass spectrometry of the molecular ion. A reader checking a report should look for the multiply charged series listed above and confirm that the deconvoluted neutral mass agrees with 1418.70 Da (monoisotopic) or about 1419.5 (average) within the stated instrument tolerance. High-resolution instruments report monoisotopic values, while single-quadrupole instruments often report averages, so it matters which one the report gives.
A certificate reports what one laboratory measured on one sample. Testing is done by a third party, and that laboratory is named on each report. Reports are identified by a Report ID or Laboratory ID. Vials carry no lot number, so that ID is the link between a vial and its document. Some material may be awaiting results, and a certificate should not be read as describing anything beyond the sample tested.
Stability and in vitro breakdown products by LC-MS
Published analytical work has characterised how this peptide behaves in in vitro incubation systems. One study reported detection of BPC 157 and in vitro metabolism experiments, using liquid chromatography with mass spectrometry to identify the resulting products (PMID: 28035768). A later study used a stable isotope labeling-based nontargeted strategy with UHPLC-HRMS to characterise the in vitro metabolic profile (PMID: 37959764). Both are method papers in the sense used here. They show how labelled and unlabelled signals, accurate mass and fragment spectra can be combined to assign product structures.
For a bench user, the practical point is that peptide products in such experiments are identified as shorter fragments of the parent sequence, seen as lower-mass ions with characteristic MS/MS fragments. The same logic applies to stored material. If a stock solution has degraded, an LC-MS run would be expected to show additional peaks at lower masses alongside the intact molecular ion. Anyone planning stability work should consult the primary papers for their matrices, incubation conditions and instrument settings rather than relying on this summary.
Bench handling and storage
Lyophilised peptide is hygroscopic. Store the sealed vial cold, commonly at −20 °C, and protected from light and moisture. Before opening, let the vial come to room temperature in a desiccated environment so condensation does not enter the powder. Weigh quickly and reseal.
For assay work, prepare a stock solution as a bench step. Choose a solvent compatible with the downstream assay, such as sterile water or a suitable buffer. Dissolve gently, without vigorous vortexing, and record the nominal concentration and the solvent. Divide the stock into small single-use aliquots to limit freeze-thaw cycles, and label each with date, concentration and the certificate's Report ID or Laboratory ID. Keep aliquots frozen, and if long-term stock stability matters for an experiment, verify it by LC-MS rather than assuming it.
Record the vial's appearance, the balance used, and any deviation from the plan in the lab notebook. These records, together with the certificate, are what let a later reader reconstruct what material was used. This material is for laboratory research use only; not for human consumption.
For research use only. This guide covers bench handling of laboratory research materials. It does not describe an application, benefit, dose, route or outcome, and nothing in it is guidance for use in a person or an animal. Nothing sold by PepXtide has been evaluated by the FDA.
Where this applies on the site
The certificate library
Every published certificate, scanned as the laboratory issued it.
Quality control
The method, the laboratory, and the real spread of results.
BPC-157
Named in this guide. Matrix & Cytoskeletal.
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Has a published certificate to read against this guide.
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Has a published certificate to read against this guide.
Tesamorelin
Has a published certificate to read against this guide.