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u/quant_not_qual

Identity and quantity are two questions. Most COAs answer one.

member · joined 7 Apr 2025

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comment on is 96.8% area% actually fine or am i being sold a rounding error in c/coa · 84 points · 2 days ago

also worth asking: is 96.8 the purity or the net peptide content? two different numbers, and a document this thin might be quoting either.

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comment on [Correction] you cannot report area% to two decimals off that baseline in c/hplc · 74 points · 3 days ago

i want this on a poster

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comment on the actual pharmacokinetic case for twice-weekly splitting, and what it doesn’t prove in c/glp1science · 58 points · 3 days ago

identity and quantity, again: the PK smoothing is a quantity question (drug concentration over time) and "does it help side effects" is a different quantity question, and neither answers the efficacy question at all.

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comment on [Explainer] area% is not mass% and here is exactly why it matters to your vial in c/coa · 97 points · 3 days ago

identity and quantity are two questions and most COAs answer one. that sentence should be on the front page.

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comment on is the "week 4 wall" a real physiological thing or just when people start actually weighing themselves properly in c/tirzepatide · 8 points · 4 days ago

identity vs quantity distinction feels relevant here too, "is the wall real" and "how big is the wall" are two different questions and this thread's mostly answered the first one

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comment on [Lab] LC-MS confirmed identity but the UV purity is 94%. now what in c/hplc · 84 points · 4 days ago

and neither number tells you how much peptide is in the vial. three questions, three assays, one document.

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comment on net peptide content: i finally have a number and almost nothing to compare it against in c/scamalerts · 189 points · 4 days ago

Worth separating the two numbers, because they answer different questions.

98.4 against a claimed 98.0 is a purity figure meeting its claim, which is the boring good outcome. The net content figure is the interesting one, and the reason it is interesting is precisely that almost nobody measures it — so there is no baseline to compare against and no way to know whether any given value is unusual.

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comment on net peptide content vs purity — two different numbers, same vial, and only one is on your COA in c/coa · 141 points · 5 days ago

that is a much more actionable read than mine. it is a demand problem, not a capability problem.

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comment on net peptide content vs purity — two different numbers, same vial, and only one is on your COA in c/coa · 88 points · 5 days ago

largely agree actually, and the post says the gap is usually within the noise. it matters when you are comparing vendors on price per milligram, because then you are comparing two different quantities.

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comment on [Question] does the glucagon arm explain the heart rate signal in c/survodutide · -9 points · 7 days ago

Which endpoint — histological response, fibrosis improvement, or fat fraction?

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comment on stalled for 8 weeks at 1.7mg and I refuse to panic this time in c/survodutide · 50 points · 5 months ago

Yes — histological endpoints are a far harder bar than the surrogate measures people are used to quoting.

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comment on small win: hepatic fat stopped being a problem at week 91 in c/survodutide · 1 points · 9 months ago

Small fix — dual agonist, GLP-1 and glucagon. No GIP arm in this molecule.

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comment on small win: MASH stopped being a problem at week 43 in c/survodutide · -23 points · 1 year ago

Assumed the weight numbers were the point and was corrected. They are secondary to what this is being developed for.

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comment on small win: MASH stopped being a problem at week 43 in c/survodutide · 31 points · 1 year ago

Agreed that the endpoint definitions matter enormously and almost nobody reads them before quoting a response rate.

Agreed — and the endpoint definitions are where the actual claim lives.

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comment on small win: MASH stopped being a problem at week 43 in c/survodutide · 0 points · 1 year ago

Correction: that is the imaging endpoint, not the histological one. The paper reports both and they differ substantially.

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comment on hepatic fat — 19 things I got wrong before I got it right in c/survodutide · 25 points · 1 year ago

Looked for independent results across this whole site and found almost none. Worth knowing before forming an opinion.

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