Canadian research peptides · independently tested
Canada’s most documented peptide source — 244 independent lab reports, a published purity floor of 93.844%, and domestic shipping.
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The date tells you when that specific batch was tested. It's useful context, but a recent date on the wrong batch is no more relevant than an old date on the right one.
The question that matters: does this COA correspond to the batch you're receiving? A perfectly fresh report for a different lot doesn't describe your product.
A certificate describes a sample on the day it was measured. The peptide in a sealed, lyophilised vial stored cold is chemically stable for a long time — months to years for most sequences — and a report from six months ago is usually still an accurate description of an unopened vial from the same batch. What changes is exposure: heat, light, moisture and repeated freeze-thaw cycles degrade peptides, and the report cannot know what the vial went through after it left the laboratory. So the date on a certificate is not an expiry; it is the moment the description was true, and the storage history since then is the part the certificate cannot cover.
An old report on the right batch is good evidence for an unopened vial that was stored as the label says. An old report on a different batch is not evidence about your vial at any age, and neither is a new one. The date matters least; the batch matters most; and the storage conditions matter in between. A buyer who asks “is this COA still valid” is usually asking the wrong question; “is this COA for my batch, and how was the batch stored” is the one with an answer.
A vendor that re-tests a batch some months after the first report is measuring exactly the thing the first report could not: whether the material held up in the vendor's own storage. Two results on one batch that agree within a point or so are strong evidence of both the material and the storage. Two that diverge are the most informative result a buyer can see, and a vendor that publishes the divergence rather than the first result alone is one whose archive is worth reading.
If a product listing points at a report dated before the batch on the label was made, the report is for an earlier batch and the listing has simply not been updated. That is common and not sinister, but it means your batch is untested until a newer report appears. If the report is dated after the batch was made and names that batch, it describes your vial. If the vendor cannot say which batch a report belongs to, the report's date is the least of the problems.
The certificate's description ends at the laboratory door; the buyer's storage begins at the letterbox. Lyophilised product kept cold, dark and dry stays close to the tested state for a long time; the same vial left on a warm shelf does not, and no certificate will reflect that. The report's date is a poor guide to the vial's condition; the buyer's own handling is a much better one.
Related: COA reuse and theft · how to verify a COA.
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Through the laboratory, not the storefront. Janoshik Analytical holds 244 reports for Growth Guys over 133 products, each opening on the lab's own site. The 181 that quote a purity figure average 99.03% and run from 93.844% to 99.99%, weaker results included rather than pruned. Orders leave from within Canada and are priced in CAD. Our count of every one.