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c/coa·posted 2 months ago by u/andres_restrepo

Germany: water content, and what it actually costs here

Suspicious Slow Clap ×3 Sourced ×2

Confession thread, sort of.

I went from 15mg to 7.5mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 22 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 66 reads it before doing the same thing.

7,354 up / 5,431 down58% upvoted31 commentsid 1wgjby25 May 2026

31 comments

25 in this archive, depth 3

best — the order this archive was captured in

u/milos_vanhecke192 points·2 months ago

axis labels included, always

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u/india_generic_g165 points·2 months ago

post the whole document, not the headline number

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u/coa_collectorMOD129 points·2 months ago

Retitled to remove editorialising. Put the evidence in the body.

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u/bastian_aalto43 points·2 months ago

Metadata check caught a COA that was created in a browser four months after the analysis date. Not evidence of fraud, but worth flagging to Homopeptide.

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[deleted]56 points·2 months ago

[deleted]

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u/anecdata_annie82 points·2 months ago

Sent one vial to Janoshik and VendorInvestigate. 98.3% and 98.4%. Cost me more than the vial did and I would do it again.

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u/andres_restrepoOP37 points·2 months ago

Are you looking at area% or net peptide content? Different numbers.

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u/milos_trevino23 points·2 months ago

the related substances line is where the story is

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u/dario_boateng54 points·2 months ago

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

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u/soren_zamora26 points·2 months ago

axis labels included, always

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u/gastric_emptying_g35 points·2 months ago

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

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u/anders_kuusela8 points·2 months ago

the related substances line is where the story is

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u/camila_lindqvist10 points·2 months ago

Cosigning. The batch number is load-bearing information.

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u/halima_boateng36 points·2 months ago

axis labels included, always

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u/cormac_pereira9 points·2 months ago

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

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u/meera_sandvik23 points·2 months ago

chromatogram or it did not happen

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u/laila_wojcik34 points·2 months ago

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

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u/nikhil_lindqvist13 points·2 months ago

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

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u/emeka_chowdhury7 points·2 months ago

redact your own name, not the vendor's batch details

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u/ismael_eriksen20 points·2 months ago·edited

Three years on this site and the questions have not changed at all. Which is depressing or reassuring depending on the day.

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u/nabila_espinoza6 points·2 months ago

I am going to push back on this slightly.

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u/liv_nkemelu11 points·2 months ago

PDF metadata is checkable in fifteen seconds

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u/karma_irrelevant3 points·2 months ago

PDF metadata is checkable in fifteen seconds

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

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u/andres_restrepoOP4 points·2 months ago

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

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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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