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c/coa·posted 1 year ago by u/india_generic_g

[Question] water content — what am I missing here

Question Well Actually ×8 Long Haul ×1 Slow Clap ×1

Quick one. Canada here.

water content works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently given advice that simply does not apply outside the US.

Specifics: the route I used took 5 weeks and cost roughly what I expected. The admin was worse than the cost. The thing that would have saved me the most time was knowing which document to ask for at the start.

Happy to answer questions from anyone in the same jurisdiction.

6,171 up / 177 down97% upvoted29 commentsid y0yvbz10 Feb 2025

29 comments

7 in this archive, depth 2

best — the order this archive was captured in

u/zaid_balogun631 points·1 year ago

Rodent data is rodent data. Dose scaling is not linear and the models tell you what to investigate, not what to expect.

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u/valeria_girard522 points·1 year ago

Half-life is about 168 hours, so steady state lands around week 14–5. Practical consequence: what you feel in week 1 is not what that dose does.

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u/sunday_shot_sal287 points·1 year ago

Water content on the document? That affects your concentration math.

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u/ignacio_silva341 points·1 year ago

the counterion is part of the mass you paid for

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u/gastric_emptying_g157 points·1 year ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

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u/purity_pedantanalytical276 points·1 year ago

axis labels included, always

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u/india_generic_gOP105 points·1 year ago

axis labels included, always

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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About c/coa

How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.

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