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c/coa·posted 9 months ago by u/nadia_kjaer

what changed for me between week 45 and week 88

COA Well Actually ×9 Sourced ×1 Receipts ×1

Confession thread, sort of.

I went from 0.5mg to 12.5mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 15 weeks later, at which point I had no way of knowing whether the dose increase did anything or whether it would have broken anyway.

So now I have early fullness I did not need and a data point I cannot interpret. Two lessons in one.

Posting it in the hope that somebody at week 17 reads it before doing the same thing.

8,040 up / 2,818 down74% upvoted36 commentsid 109gth7 Oct 2025

36 comments

28 in this archive, depth 5

best — the order this archive was captured in

u/yusuf_nakamura1.2k points·9 months ago·edited

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

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u/kavya_verhoeven1k points·9 months ago

What is the method line say? Not the technique, the actual method.

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u/nadia_kjaerOP591 points·9 months ago

no "is this good?" without saying what the compound and claimed purity are

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u/rania_okonkwo233 points·9 months ago

area% is not mass%, and here is exactly why it matters

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u/karma_irrelevant782 points·9 months ago

What were the related substances listed individually?

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u/teodor_jansen250 points·9 months ago·edited

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

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u/marisol_frisk495 points·9 months ago

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

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u/coa_collectorarchivist542 points·9 months ago

No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.

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u/soren_zamora154 points·9 months ago

no "is this good?" without saying what the compound and claimed purity are

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u/yara_antonsen174 points·9 months ago

Strongly agree. Mass% and area% are answering different questions on the same document.

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u/cesar_ivaturi-11 points·9 months ago

post the whole document, not the headline number

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u/emil_agyeman575 points·9 months ago
i wish i had read this 19 months ago
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u/aurel_boateng362 points·9 months ago

Every time this gets posted it hits the front page and every time someone has to re-explain it.

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u/soren_nkemelu110 points·9 months ago·edited

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

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u/yannick_haddad125 points·9 months ago

chromatogram or it did not happen

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u/santiago_szabo50 points·9 months ago

chromatogram or it did not happen

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

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[removed]272 points·9 months ago

[removed by moderator]

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u/nadia_fonseca219 points·9 months ago

The confident tone is doing a lot of work that the evidence is not.

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u/aurel_boateng146 points·9 months ago

chromatogram or it did not happen

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u/nikhil_lindqvist97 points·9 months ago

chromatogram or it did not happen

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

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u/dario_boateng127 points·9 months ago

Strongly agree. Mass% and area% are answering different questions on the same document.

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u/nadia_kjaerOP82 points·9 months ago

Strongly agree.

Disagree on that part. 98.1% and 99.3% on the same vial is normal.

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u/foam_head_fred45 points·9 months ago

PDF metadata is checkable in fifteen seconds

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u/anya_moreau20 points·9 months ago

chromatogram or it did not happen

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u/tidy_vialdrawer_watch288 points·9 months ago

The confident tone is doing a lot of work that the evidence is not.

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u/kavya_verhoeven93 points·9 months ago

axis labels included, always

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u/joaquin_ivaturi71 points·9 months ago

Cosigning. The batch number is load-bearing information.

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u/certified_referenceMOD80 points·9 months ago

Tracking number removed. It identifies both ends of a shipment.

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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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