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c/coa·submitted 1 year ago by u/yannick_haddad

area percent — my 20-week log, condensed into one table

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Posting this because I searched for it and got nothing useful. Setup: 0.5mg, week 78, injection-site soreness present but not ruining anything. I changed exactly one variable — related substances — and tracked it for 4 weeks. Result: a difference, but a small one, and well inside what I would call noise if someone…

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9 comments, started 1 year ago
u/sofia_ferreira542 points·1 year ago

This is the correct framing. The COA structure matters as much as the number.

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u/yannick_haddadOP253 points·1 year ago

This is the correct framing.

Disagree on that part. 98.7% and 98.3% on the same vial is normal.

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u/tomas_lehtinen197 points·1 year ago

the related substances line is where the story is

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u/emeka_beaulieu633 points·1 year ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/yannick_haddadOP323 points·1 year ago

purity and net content are two different numbers, same vial

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u/wanjiru_varga130 points·1 year ago

the related substances line is where the story is

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u/zeynep_zielinski0 points·1 year ago

Water content was 3.8%, acetate was 6.2%, purity was 99%, but net peptide was only 90% of the label weight. Perfectly honest, just chemistry.

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u/cesar_ivaturi1 point·1 year ago·edited

the batch number or it did not happen

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u/emeka_chowdhury1 point·1 year ago

Cosigning. The batch number is load-bearing information.

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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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