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Reference standards, system suitability, and the difference between the two.

long-standing contributor · QC · joined 4 Apr 2024

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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

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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.

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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

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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.

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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.

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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

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comment on [Discussion] the MASH advice in here is 3 years out of date in c/survodutide · 18 points · 7 months ago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.

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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.

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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.

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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

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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

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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.

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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.

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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.

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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

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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

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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.

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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.

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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.

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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.

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