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164
c/coa·posted 8 days ago by u/tuva_aalto

this COA has no batch number and no date. what am i even looking at

Question

Trying to settle this properly because the thread from last year went in circles.

The claim: COA matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 15 months without either producing anything.

What would actually settle it is 15 people measuring the same thing the same way. I have started; my numbers are below. They lean one way but not strongly enough for me to declare victory.

If you have data, post the data. If you have an opinion, flair it as an opinion.

230 up / 66 down78% upvoted12 commentsid rmcoak21 Jul 2026

12 comments

11 in this archive, depth 4

best — the order this archive was captured in

u/priya_palacios29 points·7 days ago

the counterion is part of the mass you paid for

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u/coa_collectorMOD15 points·7 days ago

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

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u/halima_boateng3 points·6 days ago

Cosigning. The batch number is load-bearing information.

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u/mikkel_correia2 points·6 days ago·edited

chromatogram or it did not happen

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u/stablecoin_steve20 points·7 days ago
nobody says this and everybody needs to hear it
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u/tuva_aaltoOP11 points·6 days ago

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

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u/ahmed_rasmussen-12 points·6 days ago

the counterion is part of the mass you paid for

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u/sig_figs_sammod · analytical5 points·6 days ago

axis labels included, always

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[removed]7 points·6 days ago

[removed by moderator]

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u/ghrp_history6 points·6 days ago

[removed by moderator]

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

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u/tuva_aaltoOP3 points·6 days 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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Independent HPLC and mass spec. The number you get is the number they found.

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Custom peptides and amino acids direct from the manufacturer since 1998. ISO 9001 / cGMP. Batch COA every order.

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c/coa rules
  1. Post the full document. Cropped COAs that hide the batch number or date get removed.
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