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c/coa·posted 10 days ago by u/tidy_vialdrawer_watch

[Suspicious] identical chromatogram on two different compounds from the same vendor

Suspicious Receipts ×5 Cold Box ×3

Been lurking in c/survodutide for about 14 months and finally have something worth posting.

Short version: week 15, 1.7mg, and COA is the bit I still cannot get a straight answer on. I have read the wiki, I have read the last 11 threads, and the answers split roughly down the middle.

What I actually want to know is whether the people saying it does not matter have measured it, or whether it is just repeated confidently. Happy to be told I am overthinking this — I probably am — but I would rather overthink it now than at week 21.

1,620 up / 35 down98% upvoted44 commentsid rwc9zj19 Jul 2026

44 comments

18 in this archive, depth 5

best — the order this archive was captured in

u/neha_erdogan258 points·10 days ago

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

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u/sunday_shot_sal159 points·10 days ago

I am going to push back on this slightly.

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u/tove_ogunleye0 points·9 days ago

What were the related substances listed individually?

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u/yara_antonsen266 points·9 days ago·edited
wrong community but useful, so, shrug
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u/alcohol_aversion156 points·8 days ago

This is the "correlation is mechanism" thing again. You changed three variables at once.

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u/reflux_report-28 points·8 days ago

the batch number or it did not happen

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u/amira_dumitru-33 points·8 days ago

Batch number and date of analysis? Both are load-bearing.

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u/rania_okonkwo1 point·8 days ago

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

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u/ahmed_rasmussen0 points·8 days 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 QYB.

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u/cesar_ivaturi1 point·8 days ago

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

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u/amara_halonen52 points·9 days 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/ghrp_history47 points·8 days 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/milos_vanhecke30 points·8 days ago

Sent one vial to PeptideMeter and VendorInvestigate. 99.0% and 96.8%. Cost me more than the vial did and I would do it again.

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u/low_appetite_lisa25 points·8 days ago

chromatogram or it did not happen

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u/cato_achebe34 points·8 days ago

I am going to push back on this slightly.

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u/soren_zamora26 points·8 days ago

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

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u/nadia_kjaer9 points·7 days ago

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

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u/tidy_vialdrawer_watchOP32 points·8 days ago

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

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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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