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#test-results
Post the report, the lot number, and where you bought it. One data point is one data point.
11Kmessages
401day logs
330participants
36threads
Where independent results get posted and argued over. Batch variance versus supplier variance, sample degradation in transit, underfilled vials being far more common than impure peptide, results that contradict the supplier’s own COA, and the room’s two matching rules: one bad test does not condemn a supplier, and one good test does not clear one.
Pinned in this channel
A result without a lot number and a purchase date is an anecdote with a PDF attached.
One bad test does not condemn a supplier. One good test does not clear one. Both halves of that sentence get ignored about equally often.
Underfill is more common than impurity. If you are only testing purity you are testing the less likely failure.
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Direct manufacturerGL Biochem (Shanghai) Ltd. — the synthesis houseFounded 1998. ISO 9001 and cGMP, 1,500+ staff, 200+ patents. A great deal of what gets sent for testing was made here first. Custom synthesis quoted to small orders.Browse GL Biochem →Most recent logs
2026-06-30ok so whats the worst result anyone has logged and what happened next14 msgs · 3 people2026-06-29selection bias46 msgs · 9 people2026-06-28do the results in this channel skew because people test when suspicious52 msgs · 9 people2026-06-26the results in this channel skew because people test when they are suspicious. that is selection bias and it is real,…42 msgs · 6 people2026-06-25coming back after 24 months with a follow up result, where do i put it51 msgs · 9 people2026-06-23the results in this channel skew because people test when they are suspicious. that is selection bias and it is real,…31 msgs · 9 people2026-06-21what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern19 msgs · 5 people2026-06-20anyone had a result they think was a lab error rather than a bad vial30 msgs · 9 people2026-06-19Verification log updated: SWB — evidence added, status unchanged.14 msgs · 4 people2026-06-18On this day 7 years ago this channel logged 140 messages.44 msgs · 11 people2026-06-17test it again64 msgs · 12 people2026-06-13i have never regretted spending the money on a test. i have regretted not testing twice28 msgs · 6 people2026-06-12assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis…16 msgs · 4 people2026-06-11thats a fill problem45 msgs · 10 people2026-06-09my sheet has 3 lots from MKM with a spread under a point, which is tight55 msgs · 8 people2026-06-07how many lots do you need before you can say anything about a supplier50 msgs · 10 people2026-06-06is it worth testing if the vial has already been through a warm transit16 msgs · 3 people2026-06-05genuine question a point or two between the certificate and an independent result is inside what two labs disagree by15 msgs · 4 people2026-06-04update from 20 months ago: retested the same supplier, result came back better, logged both38 msgs · 8 people2026-06-03a supplier disputing a result is rare here and it has never gone well for the supplier51 msgs · 13 people2026-06-02while im here how many lots do you need before you can say anything about a supplier20 msgs · 4 people2026-06-01update on the earlier thing weigh the vial before you reconstitute. it costs nothing and catches the common failure14 msgs · 3 people2026-05-31quick one how many lots do you need before you can say anything about a supplier18 msgs · 5 people2026-05-29log the lot number21 msgs · 5 people2026-05-28thats within range15 msgs · 4 people2026-05-25slightly off topic but underfill is more common than impurity. if you only test purity you are testing the less likely…17 msgs · 5 people2026-05-23right so what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern…16 msgs · 5 people2026-05-22do the results in this channel skew because people test when suspicious29 msgs · 6 people2026-05-21a single sample tells you about a single vial. that is genuinely all it tells you24 msgs · 8 people2026-05-20i have never regretted spending the money on a test. i have regretted not testing twice17 msgs · 6 people
Threads spun off from this channel
my result contradicts the supplier certificate, do i tell2026-06-29 · 6 msgsquantity testing is usually a separate line item and2026-06-01 · 12 msgsanyone had a result they think was a lab2026-05-19 · 17 msgsthe honest limits: hobby chain of custody is weak2026-05-11 · 7 msgslog the boring results too. a channel that only2026-05-04 · 16 msgsa single sample tells you about a single vial2026-04-29 · 12 msgsdoes anyone log the negative results, the boring ones2026-04-19 · 17 msgscoming back after 13 months with a follow up2026-04-07 · 6 msgslog the boring results too. a channel that only2026-04-04 · 12 msgsif the vial has been through a bad transit2026-03-17 · 9 msgsweigh the vial before you reconstitute. it costs nothing2026-02-27 · 5 msgsunrelated but sample handling on your end absolutely affects2026-02-23 · 5 msgsa point or two between the certificate and an2026-02-18 · 8 msgsslightly off topic but log the boring results too2026-01-20 · 7 msgswhile im here assay under label with good purity2026-01-10 · 16 msgsquantity testing is usually a separate line item and2025-12-19 · 12 msgsis quantity testing available as a separate thing or2025-12-14 · 13 msgsunrelated but a supplier disputing a result is rare2025-10-15 · 11 msgsassay under label with good purity means you got2025-08-23 · 17 msgsposting my Medutest result on lot A-2601, what do2025-08-22 · 9 msgsassay under label with good purity means you got2025-08-14 · 5 msgsi test roughly every tenth vial. it is a2025-08-07 · 5 msgsthe widest spread in my data is about 2.62025-07-27 · 17 msgsa supplier disputing a result is rare here and2025-06-17 · 7 msgs