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c/coa·submitted 2 years ago by u/camila_lindqvist

[Meta] proposal — a flair for COA posts

COAbranch of 7 comments

Something I noticed reading old threads that I have not seen said out loud. The advice on certificate of analysis in this community changed substantially around the start of last year, and nobody went back and updated the older posts. So depending on which thread the search engine hands you, you get two contradictory…

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7 comments, started 2 years ago
u/marisol_frisk269 points·2 years ago

Crossposting this to c/semaglutide because the people who need it are not reading this community.

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u/anya_moreau104 points·2 years ago

the related substances line is where the story is

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u/ignacio_silva393 points·2 years ago

Crossposting this to c/semaglutide because the people who need it are not reading this community.

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

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u/aleksi_eriksen131 points·2 years ago

the batch number or it did not happen

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u/dario_vermeulen30 points·2 years ago

the batch number or it did not happen

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

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u/bastian_aalto10 points·2 years ago·edited

axis labels included, always

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u/blunt_coldbox293 points·2 years ago

Did they give you the chromatogram or just the summary line?

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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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