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c/coa·posted 1 year ago by u/bastian_moreau

does batch actually matter or is it forum lore at this point

Question Clean Column ×8

Long-ish post, sorry. tl;dr at the bottom.

I have been tracking batch against triglycerides for 17 weeks because I could not find anyone who had. The correlation is weaker than I expected, which is itself mildly interesting given how confidently people link the two in here.

Caveats up front: one person, one lab, one assay, no control, and I changed my training in the middle of it, which was stupid.

tl;dr: probably real, definitely smaller than the threads imply, and not worth reorganising your week around.

404 up / 13 down97% upvoted24 commentsid 1vcbgo30 May 2025

24 comments

18 in this archive, depth 5

best — the order this archive was captured in

u/tidy_vialdrawer_watch35 points·1 year ago

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

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u/coa_collectorMOD18 points·1 year ago·edited

Flair changed to match the content. Read the sidebar before posting next time and we are square.

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u/teodor_lokken-6 points·1 year 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/fatima_wojcik1 point·1 year ago

Four months on the site and I was confusing area% and mass% in every post I made.

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

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u/india_generic_g1 point·1 year ago

Small correction: the trial was 3 weeks, not 36. Does not change your point but people will quote it.

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u/tidy_vialdrawer_watch1 point·1 year ago

purity and net content are two different numbers, same vial

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u/ismael_eriksen21 points·1 year ago
this is the third time this week and i love it every time
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[removed]15 points·1 year ago

[removed by moderator]

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u/cesar_ivaturi6 points·1 year ago

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

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u/bastian_moreauOP6 points·1 year ago

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

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u/nadia_kjaer12 points·1 year ago

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

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u/sofia_danquah11 points·1 year ago

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

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u/emil_agyeman9 points·1 year ago·edited

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

Adding to this: certificate of analysis is doing more work than the comment implies.

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u/bastian_moreauOP4 points·1 year ago

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

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u/gallbladder_gary3 points·1 year ago

the related substances line is where the story is

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u/tidy_vialdrawer_watch281 point·1 year ago·edited

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

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u/aurel_boateng5 points·1 year ago

the batch number or it did not happen

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u/nadia_kjaer3 points·1 year ago

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

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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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