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c/coa·posted 6 months ago by u/bastian_moreau

what would you tell week-1 you about purity

Lab

Quick one. Canada here.

related substances 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 19 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.

0 up / 0 down42% upvoted7 commentsid yvfnij16 Jan 2026

7 comments

7 in this archive, depth 4

best — the order this archive was captured in

u/milos_trevino5 points·6 months ago

Disagree. What you are describing is consistent with batch, not with what you concluded.

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u/valeria_girard-3 points·6 months ago

post the whole document, not the headline number

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u/neha_erdogan1 point·6 months ago·edited

redact your own name, not the vendor's batch details

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u/honest_syringe241 point·6 months ago

Small correction: the trial was 3 weeks, not 14. Does not change your point but people will quote it.

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u/wanjiru_varga1 point·6 months ago

Small correction: the trial was 3 weeks, not 14.

Disagree on that part. 93.7% and 99.3% on the same vial is normal.

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u/isabela_nilsen1 point·6 months ago

PDF metadata is checkable in fifteen seconds

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u/amira_dumitru4 points·6 months ago

the method line is doing real work, not just window dressing

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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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  1. Post the full document. Cropped COAs that hide the batch number or date get removed.
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