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c/coa·posted 3 months ago by u/cesar_ivaturi

week 91 check-in — 17kg down, fatigue manageable, one thing confusing me

Lab Clean Column ×3 Sourced ×2

Quick one. Canada here.

certificate of analysis works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently given advice that simply does not apply outside the US.

Specifics: the route I used took 15 weeks and cost roughly what I expected. The admin was worse than the cost. The thing that would have saved me the most time was knowing which document to ask for at the start.

Happy to answer questions from anyone in the same jurisdiction.

2,537 up / 430 down85% upvoted48 commentsid yc1kq712 Apr 2026

48 comments

10 in this archive, depth 3

best — the order this archive was captured in

u/katrin_girard343 points·3 months ago·edited

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 KP.

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u/cesar_ivaturi300 points·3 months ago

Did they give you the chromatogram or just the summary line?

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u/soren_nkemelu202 points·3 months ago

the batch number or it did not happen

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u/india_generic_g-27 points·3 months ago

Sceptical. If this were true we would see it reflected in the data and we do not.

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u/fatima_wojcik1 point·3 months ago

axis labels included, always

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u/santiago_szabo138 points·3 months ago

the batch number or it did not happen

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

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u/cesar_ivaturiOP76 points·3 months ago

Sent one vial to PeptideMeter and VendorInvestigate. 97.9% and 97.2%. Cost me more than the vial did and I would do it again.

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u/spreadsheet_gremlindata150 points·3 months ago

The COA I was holding said 96.8% area and I thought it was trash. Turns out the method was solid and the impurity profile was clean.

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u/zeynep_zielinski97 points·3 months ago

Water content matters more than people think. If a vial is carrying residual moisture, your "10mg" is not 10mg of peptide.

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u/wrong_network_w45 points·3 months ago

chromatogram or it did not happen

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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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