[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 member-funded testing is worth more than a supplied certificate: the vial tested is the vial that arrived at a member’s door.
Date of analysis anchors the result to a manufacturing period. A two-year-old result is evidence about two years ago and should be read that way.
If two or three other people have done the same thing we might actually learn something. Alone it is an anecdote.
- QSQSC source pageQingdao Sigma Chemical Co., Ltd. · Qingdao · 95% here, rank 7 · shop at qingdaosigma.com →
- HOHomopeptide source pageHunan Aslsen Technology Co., Ltd. · Changsha · 91% here, rank 16 · shop at homopeptide.net →
nofollow and sponsored; nobody here is paid for it.best — the order this archive was captured in
A series across separate lots estimates a process. Repeat tests on one lot estimate the measurement. Both are useful and they answer different questions.
Kept every report as a PDF with the batch in the filename. Two years in, it is the most useful folder I own.
Retitled — the original stated a discrepancy the numbers do not show.
I would not post that as a finding. It is a single result and the template asks you to say so.
the log is cumulative, that is the whole value of it
the log is cumulative, that is the whole value of it
Agreed — and two services on one batch is the strongest thing any of us can produce individually.
Batch number and date of analysis?
TFC BPC, batch matched the paperwork, VendorInvestigate came back 98.7% against a claimed 98.5%. Paid for it myself, posting it because the log is only worth anything if people do.
This. The trend across separate lots is the number that tells you about a process rather than a vial.
This.
This is why the template has a batch field. Without it the result is about a vial nobody can identify.
Small fix — same supplier, different lot. The two rows in the log are not the same batch.
Which service, and did you pay for it yourself?
Right, and a point or two between services is ordinary. It is agreement, and every month somebody posts it as a scandal.
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
- 1Sent a vial in specifically to check a supplier’s claim after a good…13 comments in this branch · started by u/camila_kowalski
- 2Retitled — the original stated a discrepancy the numbers do not show.11 comments in this branch · started by u/medutest_mel