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390
c/coa·posted 10 months ago by u/cormac_pereira

genuine question about batch that I am slightly embarrassed to ask

COA Clean Column ×8

Week 21 update. 7kg down from the start, reflux basically gone since about week 61.

Things that worked: consistency, protein at breakfast, walking more than I want to. Things that did not: everything I bought on the internet to help with reflux.

The part that surprised me is how much of this is admin. Ordering, storing, logging, remembering. Nobody mentions that the hard bit is not the drug, it is the routine.

Happy to answer anything. Please do not ask me what dose you should be on.

446 up / 56 down89% upvoted28 commentsid zphm3f20 Sep 2025

28 comments

23 in this archive, depth 4

best — the order this archive was captured in

u/coa_collectorMOD60 points·10 months ago

Removed a chain here. The rule is one line long and it is not negotiable.

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u/soren_nkemelu49 points·10 months ago

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

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u/clara_restrepo21 points·10 months ago

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

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u/blunt_coldbox2915 points·10 months ago

purity and net content are two different numbers, same vial

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u/amira_dumitru31 points·10 months ago

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

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u/emeka_beaulieu19 points·10 months ago

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

Adding to this: certificate of analysis is doing more work than the comment implies.

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u/sofia_danquah18 points·10 months ago

Sceptical. If this were true we would see it reflected in the data and we do not.

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u/cormac_pereiraOP10 points·10 months ago

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

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u/sofia_danquah6 points·10 months ago

post the whole document, not the headline number

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u/rania_okonkwo16 points·10 months ago

the batch number or it did not happen

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u/tidy_vialdrawer_watch285 points·10 months ago

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

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u/cormac_pereiraOP3 points·10 months ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/hugo_bergstrom1 point·10 months ago

the related substances line is where the story is

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u/cormac_pereira11 points·10 months ago

Dead space in the needle hub holds a small but non-trivial volume. On low-volume draws that can be several units.

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u/sofia_danquah5 points·10 months ago

That is net peptide content, not purity. Different number, different meaning.

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u/wrong_network_w3 points·10 months ago

Respectfully this is a sample of one presented as a finding.

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u/soren_nkemelu1 point·10 months ago

the related substances line is where the story is

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[removed]2 points·10 months ago

[removed by moderator]

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u/dead_space_doug7 points·10 months ago

purity and net content are two different numbers, same vial

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u/gallbladder_gary5 points·10 months ago·edited

purity and net content are two different numbers, same vial

Disagree on that part. 98.4% and 98.3% on the same vial is normal.

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u/certified_referenceQC2 points·10 months ago

Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.

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u/neha_erdogan5 points·10 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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