a supplier disputing a result is rare here and it has never gone well for the supplier
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#test-results 2026-01-23
Friday55 messages11 participantstimes are UTC
Highlights from this day
- verify_or_dont — a supplier disputing a result is rare here and it has never gone well for the supplier 12:05
- salt_bridge — what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern 16:30
- salt_bridge — a result without a lot number and a purchase date is an anecdote with a pdf attached 17:14
thats a fill problem
which lab
the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
weigh the vial before you reconstitute. it costs nothing and catches the common failure
i have never regretted spending the money on a test. i have regretted not testing twice
nice result
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my result contradicts the supplier certificate, do i tell them
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mghas a supplier ever disputed a result posted here
96.8 against a certificate of 98.1 is fine. the same supplier landing low four times in a row is a question
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
if you are testing to settle an argument you will not settle it with n of 1, from memory
[redacted at member request] · archive policy
log the lot number
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log the boring results too. a channel that only records failures produces a false picture
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
13:36quiet.hours pinned a message
sorry to jump in do the results in this channel skew because people test when suspicious
thats not great
attach the pdf
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem, we shall see
whats the lot
update from 26 months ago: retested the same supplier, result came back better, logged both
janoshik-a-2418.pdf
2 pages · 838 KB · not retained in the public archive
weigh it first
medutest-report-a-2418.pdf
3 pages · 625 KB · not retained in the public archive
selection bias
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one data point
unrelated but whats the worst result anyone has logged and what happened next
is a purity-only test worth the money if underfill is the common failure
thats within range
how many lots do you need before you can say anything about a supplier
posting my Medutest result on lot E-2205, what do people make of it
i test roughly every tenth vial. it is a sampling strategy, not paranoia, thats just me
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
when did you buy it
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does anyone log the negative results, the boring ones
Recon calculator: 2mg in 0.5ml = 10mg/ml.
my sheet has 3 lots from WXT with a spread under a point, which is tight, from memory
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a single sample tells you about a single vial. that is genuinely all it tells you, we shall see
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
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test it again
[edited]how do you separate batch variance from supplier variance
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if you are testing to settle an argument you will not settle it with n of 1
a point or two between the certificate and an independent result is inside what two labs disagree by
for the archive my vial assayed under label but the purity was fine, which matters more
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a result without a lot number and a purchase date is an anecdote with a pdf attached
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how much does sample handling on my end affect the number
a single sample tells you about a single vial. that is genuinely all it tells you
underfill is more common than impurity. if you only test purity you are testing the less likely failure, still working it out
do you test every order or sample it
coming back after 15 months with a follow up result, where do i put it
i told SSA about a result they would not have liked and they did not argue. credit where it is due
for the archive anyone had a result they think was a lab error rather than a bad vial
[edited]is quantity testing available as a separate thing or bundled
certificate said 98.6 and the independent came back 96.8, is that a problem
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm