Batch-number reuse
The same batch or lot number, or identical results, appearing on certificates that look like separate tests. It's worth comparing against the lab's own record.
What to look for
A batch (lot) number ties a certificate to the material that was tested. Things worth comparing: one lot number printed on certificates for different compounds, the same lot with different test dates and different results, or identical purity figures on certificates that appear to describe separate tests.
Why it isn't automatically a problem
There are ordinary explanations. A lot can be retested, several vial sizes can be filled from one lot and share one analysis, a lab can reissue a certificate with corrections, and a seller's own lot numbering may differ from the lab's sample IDs.
Purity results for well-made peptides fall in a narrow band, often 98–99.9%, so two certificates showing the same figure can happen by chance, especially when a seller has many certificates for one compound.
The most useful check is the lab's own record: where a lab offers public lookup, the report number and lot on the seller's copy should match what the lab returns.
How PeptideAudits reads this
- Where a lab offers public lookup, we check the report on the lab's site and compare the lot where the lab returns one.
- Identical purity figures for one compound can become a factual report notice on the vendor page after admin review. We skip groups that all share one lot and groups the lab's own records confirm, and we only flag a lone matching pair when one of the two is vendor-issued and the seller has few certificates for that compound.
- We don't currently flag shared lot numbers automatically. Notices state what the documents show, not intent, and they never change scores.
PeptideAudits doesn't test products; values come from certificates sellers publish. See the scoring methodology.
For research use only. Not medical advice.