[PSA] a vendor-supplied COA is a marketing document until someone else agrees with it
a vendor-supplied COA is a marketing document until someone else agrees with it. It comes up every few weeks and the answer has not changed.
Inter-lab variance on this assay runs a point or two either way. Two services disagreeing by that much is agreement, not a discrepancy, and treating it otherwise starts pointless arguments.
Asked GL Biochem for the batch record on a Tuesday and had the full document, batch and method line, before the end of the day. That is the bar now.
Sent the same compound from TFC and SSA to VendorInvestigate in the same month. Both came back above the claim on the certificate — mine was 97.7% on a stated 97.0%.
Research-use-only material is not approved for human use and nothing here should be read as a recommendation to use it.
best — the order this archive was captured in
Left up. It names an operation, it carries a date and a lot, and it is written as a report rather than an accusation.
[removed by moderator]
NUPEPS Peptides shows up in threads constantly and has almost nothing on file
a directory entry is a record, not a recommendation
What a batch record should carry: the lot identifier, the date of analysis, the method including column and gradient, the individual related substances rather than a total, and the storage condition the stability statement was written against.
reship policy in writing before the order, not after
Kept a spreadsheet of quoted versus actual lead time across 13 orders. The quoted number held.
Agree. The verification log is the part with the checkable facts in it; the number at the top is just a summary of a lot of averaging.
Regional stock made more difference to my planning than anything else — ordering from a warehouse in Canada took the customs question off the table entirely.
the source page log is more useful than the score above it
Eternal Peptides came up in three threads the week I was ordering and I could not find a single independent result for them anywhere. Went with a documented supplier instead.
Independent testing is worth more than a supplied certificate for one structural reason: the chain of custody. A member who buys, ships and pays is testing the same thing you would receive.