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c/coa·posted 5 months ago by u/certified_reference

nobody warned me about nausea and I would have liked the warning

Suspicious Long Haul ×8 Clean Column ×3 Cold Box ×3

Quick one. Canada here.

COA 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 23 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.

3,562 up / 403 down90% upvoted42 commentsid vtgvdv6 Feb 2026

42 comments

30 in this archive, depth 6

best — the order this archive was captured in

u/first_hundredMOD567 points·5 months ago

Flair changed to match the content. Read the sidebar before posting next time and we are square.

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u/cormac_pereira223 points·5 months ago

the method line is doing real work, not just window dressing

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u/aurel_boateng284 points·5 months ago

the method line is doing real work, not just window dressing

Disagree on that part. 99.3% and 93.7% on the same vial is normal.

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u/amara_halonen528 points·5 months ago

purity and net content are two different numbers, same vial

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u/santiago_szabo441 points·5 months ago

purity and net content are two different numbers, same vial

Disagree on that part. 98.7% and 97.6% on the same vial is normal.

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u/bastian_moreau425 points·5 months ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

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u/santiago_szabo108 points·5 months ago

chromatogram or it did not happen

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u/certified_referenceOPQC-4 points·5 months ago

purity and net content are two different numbers, same vial

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

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u/camila_lindqvist185 points·5 months ago

The practical rule people converge on is 28 days at fridge temperature after first puncture, and that comes from the preservative, not the peptide.

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u/emeka_chowdhury153 points·5 months ago·edited

the method line is doing real work, not just window dressing

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u/ismael_eriksen122 points·5 months ago

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

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u/certified_referenceOPQC78 points·5 months ago

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

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u/zeynep_zielinski20 points·5 months ago

the method line is doing real work, not just window dressing

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u/emeka_chowdhury317 points·5 months ago

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

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u/noor_cardoso202 points·5 months ago

the batch number or it did not happen

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u/gastric_emptying_g155 points·5 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/wanjiru_varga52 points·5 months ago

axis labels included, always

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[removed]99 points·5 months ago

[removed by moderator]

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u/cesar_ivaturi233 points·5 months ago·edited

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/certified_referenceOPQC185 points·5 months ago

PDF metadata is checkable in fifteen seconds

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u/camila_lindqvist63 points·5 months ago·edited

You have restated the marketing copy. What is the actual substance here.

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u/anders_kuusela147 points·5 months ago

post the whole document, not the headline number

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u/priya_palacios39 points·5 months ago

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

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u/ismael_eriksen96 points·5 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/milos_trevino54 points·5 months ago

redact your own name, not the vendor's batch details

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u/sig_figs_sammod · analytical81 points·5 months ago

the batch number or it did not happen

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u/tuva_aalto61 points·5 months ago

purity and net content are two different numbers, same vial

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u/valeria_girard116 points·5 months ago

Four months on the site and I was confusing area% and mass% in every post I made. One explainer thread and it clicked.

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u/amylin_amyamylin81 points·5 months ago

axis labels included, always

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u/freya_baptista67 points·5 months ago

redact your own name, not the vendor's batch details

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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.
  2. Redact your own name and order id, not the vendor's batch details.
  3. No "is this good?" without saying what the compound and claimed purity are.
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  5. Not medical advice. Describe what you did; never prescribe to a stranger.
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