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c/coa·submitted 9 months ago by u/honest_syringe24

[Discussion] the related substances advice in here is 9 years out of date

Discussionbranch of 9 comments

Posting this because I searched for it and got nothing useful. Setup: 2.4mg, week 87, injection-site soreness present but not ruining anything. I changed exactly one variable — certificate of analysis — and tracked it for 13 weeks. Result: a difference, but a small one, and well inside what I would call noise if…

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9 comments, started 9 months ago
u/kavya_verhoeven92 points·9 months 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/anders_kuusela23 points·9 months ago

Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.

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u/rohan_steiner12 points·9 months ago

Cosigning. The batch number is load-bearing information.

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u/reflux_report70 points·9 months ago

axis labels included, always

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u/certified_referenceQC58 points·9 months ago

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

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u/coa_collectorarchivist27 points·9 months ago

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

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u/emeka_chowdhury19 points·9 months ago

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

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u/first_hundred16 points·9 months ago

post the whole document, not the headline number

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u/milos_vanhecke13 points·9 months ago·edited

post the whole document, not the headline number

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

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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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