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c/coa·posted 9 months ago by u/elodie_yilmaz

week 56 check-in — 12kg down, injection-site soreness manageable, one thing confusing me

Lab Cold Box ×5 Slow Clap ×1

Quick one. Canada here.

related substances 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 2 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.

1,612 up / 428 down79% upvoted47 commentsid 10tg0v25 Oct 2025

47 comments

19 in this archive, depth 4

best — the order this archive was captured in

u/marisol_frisk233 points·9 months ago

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

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u/elodie_yilmazOP-37 points·9 months ago

chromatogram or it did not happen

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u/yara_antonsen0 points·9 months ago

axis labels included, always

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[removed]1 point·9 months ago

[removed by moderator]

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u/step_therapy_s183 points·9 months ago

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.

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u/vito_chowdhury134 points·9 months ago·edited
okay but what dose
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u/milos_trevino78 points·9 months ago

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

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u/anecdata_annie60 points·9 months 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/noor_cardoso37 points·9 months ago

axis labels included, always

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u/receptor_bias_rick16 points·9 months ago

That is net peptide content, not purity. Different number, different meaning.

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u/first_hundredMOD61 points·9 months ago

This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.

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u/sig_figs_sammod · analytical17 points·9 months ago

This is an urgent-care question wearing a forum question's clothes.

Yes, exactly this, and it is the bit that took me 17 weeks to accept.

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u/milos_vanhecke38 points·9 months ago

axis labels included, always

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u/anya_correia39 points·9 months ago

purity and net content are two different numbers, same vial

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u/yara_antonsen32 points·9 months ago·edited

purity and net content are two different numbers, same vial

Disagree on that part. 97.4% and 96.2% on the same vial is normal.

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u/amara_halonen21 points·9 months ago

purity and net content are two different numbers, same vial Disagree on that part.

Disagree on that part. 95.1% and 98.9% on the same vial is normal.

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u/soren_zamora28 points·9 months ago

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

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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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