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c/coa·posted 8 months ago by u/amara_halonen

nobody warned me about reflux and I would have liked the warning

Discussion Receipts ×1 Slow Clap ×2 Cold Box ×3

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

Setup: 0.5mg, week 95, injection-site soreness present but not ruining anything. I changed exactly one variable — area percent — and tracked it for 15 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.

3,872 up / 517 down88% upvoted54 commentsid 113fmk17 Nov 2025

54 comments

29 in this archive, depth 5

best — the order this archive was captured in

u/low_appetite_lisa246 points·8 months ago

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

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u/mikkel_correia200 points·8 months ago·edited

Slight fix: the number was 97.6, not 98.0. Decimal point, but a fairly consequential one.

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[removed]87 points·8 months ago

[removed by moderator]

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u/certified_referenceQC53 points·8 months ago

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

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u/isabela_nilsen-37 points·8 months ago

the batch number or it did not happen

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u/dario_boateng205 points·8 months ago

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

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u/nadia_fonseca164 points·8 months ago·edited

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

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u/cato_achebe156 points·8 months ago

post the whole document, not the headline number

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u/amara_halonenOP66 points·8 months ago

post the whole document, not the headline number

Disagree on that part. 96.8% and 96.2% on the same vial is normal.

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u/amylin_amyamylin98 points·8 months ago

post the whole document, not the headline number

Disagree on that part. 98.9% and 99.0% on the same vial is normal.

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u/tuva_aalto0 points·8 months ago

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

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u/ghrp_history1 point·8 months ago

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

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u/step_therapy_s67 points·8 months ago

chromatogram or it did not happen

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u/clara_restrepo177 points·8 months ago

purity and net content are two different numbers, same vial

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u/sofia_ferreira63 points·8 months ago

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

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u/emeka_chowdhury0 points·8 months ago

the related substances line is where the story is

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u/janek_ferrari1 point·8 months ago

the related substances line is where the story is

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

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u/tidy_vialdrawer_watch1 point·8 months ago

axis labels included, always

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u/ignacio_silva66 points·8 months ago

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

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u/meera_sandvik18 points·8 months ago

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

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u/ignacio_silva14 points·8 months ago

axis labels included, always

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u/dario_vermeulen8 points·8 months ago

purity and net content are two different numbers, same vial

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u/karma_irrelevant42 points·8 months ago

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

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u/tidy_vialdrawer_watch16 points·8 months ago

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

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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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