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c/coa·posted 2 months ago by u/blunt_coldbox29

COA is the most under-discussed thing in c/semaglutide

Discussion Sourced ×8

Posting this because I searched for it and got nothing useful.

Setup: 0.25mg, week 28, injection-site soreness present but not ruining anything. I changed exactly one variable — water content — and tracked it for 2 weeks.

Result: a difference, but a small one, and well inside what I would call noise if someone else posted it. So I am putting it here rather than presenting it as a finding. If two or three other people have done the same thing we might actually learn something.

Not medical advice, obviously. This is one person with a spreadsheet.

1,124 up / 325 down78% upvoted50 commentsid 10txzy6 May 2026

50 comments

15 in this archive, depth 4

best — the order this archive was captured in

u/alcohol_aversion154 points·2 months ago

Metadata check caught a COA that was created in a browser four months after the analysis date. Not evidence of fraud, but worth flagging to SGN.

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u/dead_space_doug94 points·2 months ago

PDF metadata is checkable in fifteen seconds

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u/gallbladder_gary23 points·2 months ago

PDF metadata is checkable in fifteen seconds

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/chidi_demir181 points·2 months ago

axis labels included, always

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u/reflux_report133 points·2 months ago·edited

Not convinced. The evidence does not support that reading.

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u/laila_wojcik106 points·2 months ago

PDF metadata is checkable in fifteen seconds

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u/teodor_lokken-36 points·2 months ago

No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.

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u/stablecoin_steve1 point·2 months ago

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

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u/priya_palacios1 point·2 months ago

No.

Yes, exactly this, and it is the bit that took me 92 weeks to accept.

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u/tuva_aalto1 point·2 months ago·edited

purity and net content are two different numbers, same vial

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u/meera_sandvik1 point·2 months ago

the counterion is part of the mass you paid for

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u/meera_sandvik1 point·2 months ago

No.

Yes, exactly this, and it is the bit that took me 36 weeks to accept.

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u/coa_janitorMOD45 points·2 months ago

Removed a chain here. The rule is one line long and it is not negotiable.

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u/ignacio_silva0 points·2 months ago

chromatogram or it did not happen

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u/priya_palacios1 point·2 months ago·edited

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

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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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Independent HPLC and mass spec. The number you get is the number they found.

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Custom peptides and amino acids direct from the manufacturer since 1998. ISO 9001 / cGMP. Batch COA every order.

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c/coa rules
  1. Post the full document. Cropped COAs that hide the batch number or date get removed.
  2. Redact your own name and order id, not the vendor's batch details.
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