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c/coa·posted 24 days ago by u/dead_space_doug

net peptide content vs purity — two different numbers, same vial

COA Well Actually ×4 Cold Box ×2

Week 11 update. 22kg down from the start, muscle cramps basically gone since about week 51.

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 muscle cramps.

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.

1,223 up / 255 down83% upvoted19 commentsid 1v2i5z6 Jul 2026

19 comments

15 in this archive, depth 5

best — the order this archive was captured in

u/nabila_espinoza118 points·23 days 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/anya_moreau0 points·23 days ago

chromatogram or it did not happen

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u/dead_space_dougOP1 point·23 days ago

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

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u/tomas_lehtinen68 points·24 days ago

Cosigning. The batch number is load-bearing information.

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u/nikhil_lindqvist74 points·23 days ago

chromatogram or it did not happen

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u/nikhil_lindqvist26 points·23 days ago

post the whole document, not the headline number

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u/first_hundred29 points·23 days ago

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

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[deleted]18 points·22 days ago

[deleted]

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u/aurel_boateng12 points·22 days ago

axis labels included, always

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u/dead_space_dougOP9 points·22 days ago

The chromatogram trace is where the real information lives. The summary number is just a headline.

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u/neha_erdogan9 points·22 days ago·edited

axis labels included, always

Yes, exactly this, and it is the bit that took me 54 weeks to accept.

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u/laila_wojcik50 points·23 days ago

Titration speed is a side-effect dial far more than an efficacy dial.

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u/joaquin_ivaturi72 points·22 days ago

Mechanistically the bit that matters is area percent. It explains most of the early profile and a decent chunk of the outcome.

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u/tidy_vialdrawer_pls24 points·23 days ago

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

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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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