[Vendor] Homopeptide vs QSC on the same compound, same month — both cleared 98.0%
Right: Homopeptide vs QSC on the same compound, same month — both cleared 98.0%. I paid for this one myself, nobody sent me anything, and the receipts are in the comments. The numbers the title promised, since a headline without them is worthless: 98.0%. Everything below is context for those. Chain of custody is why…
Sent a vial in specifically to check a supplier’s claim after a good experience. It matched. Boring result, worth logging.
How to build a series that means something, if you are going to spend money on testing anyway.
Three tests on one lot tells you about your measurement. Three tests on three lots, spread over a year, tells you about a process. The second is the one worth paying for and it costs the same.
Buy small, keep the batch numbers, send one vial per lot, and post each one with the claim next to it. After four or five you have something no individual review can give you: a band, a direction and a date range. That is what the source pages are made of.
post the claim next to the result or the number floats
inter-lab variance runs a point or two, plan your outrage accordingly
say whether you paid for it yourself
Have now spent more on testing than on some of the orders. No regrets — the log is the reason I can buy without agonising.
Do you have the trace, or only the summary?
That reading assumes area percent and net peptide content are the same number. They are not, and the report says which it is.
Tested three lots over a year rather than three vials from one lot. Cost the same and told me something completely different.
Split one vial between Medutest and Janoshik. The two numbers were within half a point of each other and I stopped worrying about which lab to trust.
the trend across lots is worth more than any single figure