the "our facility" photo on half these sites reverse-searches to a stock library
Posting this as a discussion rather than a claim: the "our facility" photo on half these sites reverse-searches to a stock library. Started buying small deliberately, tested every lot for the first four, then stopped testing every lot because there was nothing to find. Sent the same compound from TFC and Homopeptide…
The order I actually check things in, for anyone building a process rather than asking about one supplier.
First, the record: source page, verification log, and how many separate lots have been tested rather than how many tests exist. Second, the paperwork: ask for a batch-specific certificate and see what comes back and how fast. Third, the logistics: quoted lead time, minimum quantity, which lines are held in regional stock. Fourth, buy small and test it yourself.
Nothing in that list is exotic and all of it is answerable before you spend real money. Most of the disappointment posts on this board skipped step two.
The source pages link the supplier’s own storefront on purpose, so you can read their account against ours.
the source page log is more useful than the score above it
what does the certificate actually carry — that is the whole question
This. Ask for the batch record. The ones who send it inside a day have told you more than any review could.
reship policy in writing before the order, not after
consistency across lots beats one spectacular result
Kept a spreadsheet of quoted versus actual lead time across 8 orders. The quoted number held.
the wider-market names in the table are there because nobody has enough data on them
I would separate documentation from logistics. A supplier can be excellent at one and ordinary at the other, and averaging them hides it.