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c/coa·submitted 2 months ago by u/isabela_nilsen

the related substances thing finally clicked for me and I want to write it down

COAbranch of 6 comments

Posting this as a discussion rather than a claim: the related substances thing finally clicked for me and I want to write it down. The document I was worried about turned out to be a re-issue with a later creation date. Asked, got the original, entirely ordinary. Sent one vial to Medutest and Janoshik. 98.4% and a…

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This branch

6 comments, started 2 months ago
u/kavya_verhoeven-28 points·2 months ago

Related substances itemised individually is a much stronger document than a single total, because it tells you the shape of the impurity profile rather than its size.

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u/isabela_nilsenOP1 point·2 months ago

the related substances line is where the story is

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u/milos_trevino1 point·2 months ago

Yes. The structure of the document matters at least as much as the number printed on it.

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u/meera_sandvik1 point·2 months ago

post the whole document, not the headline number

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u/foam_head_fred1 point·2 months ago

Disagree that a lower number is automatically worse. A conservative claim that survives testing is worth more than an optimistic one that does not.

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u/dario_boateng1 point·2 months ago

My first certificate had a compound name, a percentage and a logo. I thought that was normal. It is not, and now I know what to ask for.

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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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