BPC-157 COA: how to read a BPC-157 certificate of analysis

Check the lot number first, not the purity

Most people jump straight to the purity figure. That is backwards. A 99.9% result is meaningless if it belongs to a different batch than the one you are holding. Every peptide synthesis run produces its own lot, and each lot can differ in purity, salt content and fill weight. A certificate describes one lot and only that lot.

So the first check is simple: find the lot number on the certificate and compare it with the lot printed on the vial or the order paperwork. If the supplier shows a single “representative” COA for every bottle they have ever sold, or the certificate has no lot number at all, treat the purity number as marketing.

At Synagenics every vial label carries a lot code, and the COA library lists certificates by that same code, so the match takes seconds.

The four results that matter on a BPC-157 certificate

1. Purity (HPLC-UV)

High-performance liquid chromatography separates everything in the sample and measures each component with a UV detector. The purity figure is the main BPC-157 peak’s share of the total peak area. A result of 99.34% means that, of everything the instrument detected, 99.34% was the target peptide and 0.66% was something else. For a 15-amino-acid peptide, anything above 98% is solid research grade.

Two things to know: purity is relative, not absolute, and it says nothing about how much powder is in the vial. That is why the next lines matter.

2. Identity (LC-MS)

Purity tells you a sample is clean. Identity tells you it is the right compound. Mass spectrometry measures the molecular weight of the main peak and compares it with the expected value. BPC-157 is a 15-residue peptide (Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val) with a molecular weight of roughly 1,419.5 Da. A certificate should state the identity result as confirmed, ideally alongside the observed mass.

A purity number without an identity test is a gap. A clean peak of the wrong molecule would still score high on HPLC.

3. Net content (mg)

Net content is the measured amount of peptide actually in the vial, reported in milligrams. Labels state a nominal fill such as 5 mg or 10 mg. A good certificate shows a measured figure at or above that label claim. This is the line that catches under-filled vials, which purity testing alone will never reveal.

4. Appearance, dates and the lab

The appearance line should read something like “white lyophilized powder.” The received and reported dates tell you when the lab tested the sample, so you can see how recent the data is. The certificate should name the independent laboratory and carry an accession or report number you could reference if you ever contacted that lab.

Worked example: Synagenics lot BB10-05-0626

Here is how those checks look on a real Synagenics certificate. This lot is the BPC-157 and TB-500 5 mg / 5 mg research blend, tested by an independent third-party lab.

Every line checks out: the lot matches, both identities are confirmed, purity is over 99% and the measured content exceeds the label. You can open the full certificate, including the chromatogram, here: BPC-157 and TB-500 lot BB10-05-0626 certificate (PDF).

What the small peaks on a BPC-157 chromatogram usually are

Even an excellent lot shows a few minor peaks next to the main one. For a synthetic 15-residue chain, these are usually by-products of solid-phase synthesis rather than contamination from outside:

• Deletion sequences: chains missing one amino acid because a coupling step did not complete. They elute very close to the main peak.
• Truncated sequences: shorter fragments where chain growth stopped early.
• Aspartate-related by-products: BPC-157 contains two adjacent aspartic acids (Asp-Asp), a position where small rearranged variants can form during synthesis.
• Residual counter-ions and salts: these do not show as peptide peaks but are one reason net content and gross powder weight differ.

The point is not to find zero minor peaks. It is to see one dominant peak and a purity figure that reflects it honestly.

A two-minute check you can run on any BPC-157 COA

• Does the lot number on the certificate match your vial?
• Is purity measured by HPLC and stated as a specific number, not “99%+” alone?
• Is there an identity result from mass spectrometry?
• Is net content measured in milligrams and at or above the label?
• Are the received and reported dates recent and in a logical order?
• Is an independent lab named, with a report or accession number?
• Does the chromatogram show one dominant peak?

Seven yeses means you are looking at a real, lot-specific certificate. Two or more noes is a reason to ask the supplier questions before you order.

Red flags that a BPC-157 certificate is not what it seems

• The same certificate is shown for every size and every batch.
• Dates are missing, or the report is years old for a product sold today.
• The purity is a round number with no chromatogram behind it.
• There is no identity test, only purity.
• The “lab” is the seller itself, or the lab name cannot be found anywhere.
• The document is a screenshot with the lot field cropped out.

Where Synagenics publishes its BPC-157 certificates

Synagenics publishes certificates by lot number in its COA library. Each entry lists the HPLC purity, the LC-MS identity result, the report date and a link to the full document. New lots are added as they come back from the lab. If you hold a vial whose lot you cannot find yet, email support@synagenics.com with the lot code and the team will send the certificate.

For more on how testing works, see From Our Lab and the research peptide testing and COA guide. For ordering, labels and shipping, see Trusted Quality.

What this page deliberately does not cover

This guide explains how to read analytical documents. It does not discuss any use of BPC-157 outside the laboratory, and it gives no handling or preparation guidance of any kind. All Synagenics products are sold for in vitro laboratory research only. They are not drugs, supplements or cosmetics and are not for human or animal use.

Frequently Asked Questions: BPC-157 COA

What does a BPC-157 certificate of analysis show?

It shows the test results for one specific lot: HPLC purity as a percentage, an identity result from mass spectrometry, the measured net content in milligrams, the appearance of the powder, the lot number, the dates the sample was received and reported, and the name of the testing laboratory.

What purity should research-grade BPC-157 have?

Research-grade BPC-157 typically tests above 98% by HPLC. Synagenics batches test over 99%. The figure should always come with a lot number and a chromatogram so you can see the data behind it.

Why are purity and net content different numbers?

They measure different things. Purity compares the BPC-157 peak with everything else in the sample. Net content measures how many milligrams of peptide are physically in the vial. A vial can be 99% pure and still under-filled, which is why both lines matter.

Why does the lot number matter so much?

Each synthesis run is its own lot, and results vary from lot to lot. A certificate only describes the lot it names, so a COA is only meaningful for your vial if the lot numbers match.

What is the molecular weight of BPC-157?

BPC-157 has a molecular weight of approximately 1,419.5 Da. Mass spectrometry on the certificate should confirm a mass consistent with that value.

Where can I see Synagenics BPC-157 certificates?

All published certificates are listed by lot number in the Synagenics COA library at synagenics.com/coas/. If your lot is not listed yet, email support@synagenics.com with the lot code.