u/certified_reference
Reference standards, system suitability, and the difference between the two.
long-standing contributor · QC · joined 4 Apr 2024
Comments — page 3 of 5
comment on stalled for 20 weeks at 1.0mg and I refuse to panic this time in c/coa · 794 points · 5 months ago
PDF metadata is checkable in fifteen seconds
comment on stalled for 20 weeks at 1.0mg and I refuse to panic this time in c/coa · 1k points · 5 months ago
Retitled to remove editorialising. Put the evidence in the body.
comment on what changed for me between week 5 and week 48 in c/tirzepatide · 1 points · 5 months ago
SURMOUNT data is messier than STEP data but the weight loss is there
comment on nobody warned me about nausea and I would have liked the warning in c/coa · 78 points · 5 months ago
This is the correct framing. The COA structure matters as much as the number.
comment on nobody warned me about nausea and I would have liked the warning in c/coa · -4 points · 5 months ago
purity and net content are two different numbers, same vial
Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.
comment on nobody warned me about nausea and I would have liked the warning in c/coa · 185 points · 5 months ago
PDF metadata is checkable in fifteen seconds
comment on [Discussion] the MASH advice in here is 3 years out of date in c/survodutide · 18 points · 7 months ago
The practical rule people converge on is 28 days at fridge temperature after first puncture, and that comes from the preservative, not the peptide.
comment on my TSH moved and I cannot work out whether area percent is why in c/coa · 38 points · 7 months ago
Water content was 3.8%, acetate was 6.2%, purity was 99%, but net peptide was only 90% of the label weight. Perfectly honest, just chemistry.
comment on my TSH moved and I cannot work out whether area percent is why in c/coa · 117 points · 7 months ago
Flair changed to match the content. Read the sidebar before posting next time and we are square.
comment on switched from 7.5mg to 15mg and the nausea got better, not worse in c/tirzepatide · 34 points · 7 months ago
SURMOUNT data is messier than STEP data but the weight loss is there
comment on switched from 7.5mg to 15mg and the nausea got better, not worse in c/tirzepatide · 18 points · 7 months ago
nope, the equivalence to semaglutide is not known, comparing 15mg tirz to 2.4mg sema is guessing
comment on nobody warned me about reflux and I would have liked the warning in c/coa · 53 points · 8 months ago
That is net peptide content, not purity. Different number, different meaning.
comment on the Netherlands: area percent, and what it actually costs here in c/coa · 6 points · 8 months ago
Not to be pedantic but certificate of analysis and batch are being used interchangeably and they are not interchangeable in real life.
comment on Denmark: dual agonist, and what it actually costs here in c/survodutide · 30 points · 9 months ago
Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.
comment on [Discussion] the related substances advice in here is 9 years out of date in c/coa · 58 points · 9 months ago
area% is not mass%, and here is exactly why it matters
comment on does Zepbound actually matter or is it forum lore at this point in c/tirzepatide · 359 points · 9 months ago
the appetite change on tirz is more than just reduced hunger, it is different machinery
comment on what changed for me between week 45 and week 88 in c/coa · 80 points · 9 months ago
Tracking number removed. It identifies both ends of a shipment.
comment on [Lab] 15th independent test on QSC, and the trend is the interesting part in c/coa · 56 points · 10 months ago
Retitled to remove editorialising. Put the evidence in the body.
comment on genuine question about batch that I am slightly embarrassed to ask in c/coa · 2 points · 10 months ago
Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.
comment on three years of data logger threads, summarised so you do not have to read them in c/coldchain · 91 points · 10 months ago
Germany to Germany: 13 days with ERP and 13 days with QST. Same route, different carriers, variance is real.