Batch testing explained

A product page tells you what a compound is supposed to be. A batch, or lot, is the physical run of material associated with the specific item in front of you, and it is the batch—not merely the product line—that a report must identify. Two items with the same product name can come from different lots; only exact, lot-specific documentation can support a conclusion about a given item.

When a product carries a batch or lot identifier, use it with the product name and labeled quantity to search the public COA library. Only an exact matching report should be used to evaluate the laboratory results for that product.

Testing itself happens in two passes, run by an independent third-party laboratory rather than in-house. HPLC quantifies purity, as covered separately. Mass spectrometry confirms molecular identity, verifying that the compound present actually matches the expected mass of the target peptide rather than a structurally similar byproduct. A lot only clears as PASS once both results are in and both meet the threshold.

The certificate of analysis produced from that testing is a public document. It lists the lot code, the compound, the purity result, the test date, and the pass/fail outcome, and it is published the moment it clears, not withheld or issued only on request. That is a deliberate choice: documentation that exists but isn't searchable functions the same as documentation that doesn't exist.

For a researcher, the practical takeaway is to treat the lot code as the unit that matters, not the product name. When you look up a batch, you're not confirming that 'BPC-157 is supposed to be pure.' You're confirming that the specific vial you have in hand, identified by its lot code, was independently tested and passed.