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Single comment threadYou are looking at one branch of [Meta] the batch rule is doing its job and people should stop complaining — 38 comments in the full submission. View in context.
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c/coa·submitted 2 years ago by u/dead_space_doug

[Meta] the batch rule is doing its job and people should stop complaining

COAbranch of 7 comments

Something I noticed reading old threads that I have not seen said out loud. The advice on certificate of analysis in this community changed substantially around the start of last year, and nobody went back and updated the older posts. So depending on which thread the search engine hands you, you get two contradictory…

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7 comments, started 2 years ago
u/dario_boateng72 points·2 years ago

Crossposting this to c/progresspics because the people who need it are not reading this community.

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u/dead_space_dougOP43 points·2 years ago

purity and net content are two different numbers, same vial

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u/nadia_kjaer0 points·2 years ago

the related substances line is where the story is

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u/anecdata_annie1 point·2 years ago

purity and net content are two different numbers, same vial

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u/dead_space_dougOP1 point·2 years ago·edited

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/tuva_aalto1 point·2 years ago

the related substances line is where the story is

Disagree on that part. 97.4% and 97.6% on the same vial is normal.

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u/dead_space_dougOP1 point·2 years ago

Asked KP for the batch-specific COA and they sent it within six hours, full document, batch number, date, everything. That is the baseline.

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