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c/coa·posted 10 months ago by u/first_hundred

does area percent actually matter or is it forum lore at this point

Discussion Receipts ×5

Posting this because I searched for it and got nothing useful.

Setup: 1.0mg, week 69, constipation present but not ruining anything. I changed exactly one variable — area percent — and tracked it for 12 weeks.

Result: a difference, but a small one, and well inside what I would call noise if someone else posted it. So I am putting it here rather than presenting it as a finding. If two or three other people have done the same thing we might actually learn something.

Not medical advice, obviously. This is one person with a spreadsheet.

375 up / 11 down97% upvoted24 commentsid yvit0i11 Sep 2025

24 comments

20 in this archive, depth 5

best — the order this archive was captured in

u/bastian_moreau64 points·10 months ago·edited

post the whole document, not the headline number

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[deleted]26 points·10 months ago

[deleted]

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u/emeka_beaulieu20 points·10 months ago·edited

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

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u/valeria_girard10 points·10 months ago

Strongly agree.

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

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u/cormac_pereira8 points·10 months ago·edited

This is the correct framing. The COA structure matters as much as the number.

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u/first_hundredOP7 points·10 months ago

The COA I was holding said 96.8% area and I thought it was trash. Turns out the method was solid and the impurity profile was clean.

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u/freya_baptista66 points·10 months ago

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

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u/kavya_verhoeven45 points·10 months ago

post the whole document, not the headline number

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u/tomas_lehtinen46 points·10 months ago

Sent one vial to Janoshik and VendorInvestigate. 94.2% and 95.1%. Cost me more than the vial did and I would do it again.

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u/valeria_girard30 points·10 months ago

Four months on the site and I was confusing area% and mass% in every post I made. One explainer thread and it clicked.

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u/coa_collectorarchivist24 points·10 months ago

the counterion is part of the mass you paid for

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u/tove_ogunleye25 points·10 months ago

This is the correct framing. The COA structure matters as much as the number.

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u/india_generic_g19 points·10 months ago

Tested the GLB raw material and a reseller vial side-by-side. Same purity claim, different impurity profiles. Handling matters.

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u/ahmed_rasmussen11 points·10 months ago

axis labels included, always

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u/freya_baptista4 points·10 months ago·edited

PDF metadata is checkable in fifteen seconds

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u/vito_chowdhury-11 points·10 months ago

This is the correct framing.

Adding to this: water content is doing more work than the comment implies.

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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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