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c/coa·submitted 1 months ago by u/chidi_demir

anyone else notice certificate of analysis kicking in around week 75

Discussionbranch of 7 comments

Trying to settle this properly because the thread from last year went in circles. The claim: purity matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 23 months without either producing anything. What would actually settle it is 11 people measuring the same…

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7 comments, started 1 months ago
u/neha_erdogan20 points·1 months ago

The practical rule people converge on is 28 days at fridge temperature after first puncture, and that comes from the preservative, not the peptide.

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u/soren_zamora8 points·1 months ago

Cosigning. The batch number is load-bearing information.

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u/first_hundredMOD11 points·1 months ago

Tracking number removed. It identifies both ends of a shipment.

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u/honest_syringe248 points·1 months ago

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

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u/karma_irrelevant2 points·1 months ago

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

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u/honest_syringe246 points·1 months ago·edited

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

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u/bastian_aalto16 points·1 months ago

axis labels included, always

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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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