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c/coa·posted 6 months ago by u/hassan_chowdhury

stalled for 22 weeks at 1.0mg and I refuse to panic this time

Question Clean Column ×2 Sourced ×1 Slow Clap ×3

water content. That is the whole post, but I will justify it.

Everything else people worry about in c/darkspot is downstream of it. Titration speed, muscle cramps, the endless dose arguments — most of it resolves if you sort water content out first, and almost nobody does.

I say this having got it wrong for 13 months. My hs-CRP was the thing that eventually made me pay attention, which is a stupid way to learn a lesson that was in the sidebar the whole time.

3,747 up / 435 down90% upvoted63 commentsid ylg1tk10 Jan 2026

63 comments

30 in this archive, depth 5

best — the order this archive was captured in

u/elodie_yilmaz457 points·6 months ago

axis labels included, always

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u/isabela_nilsen288 points·6 months ago

Disagree. What you are describing is consistent with COA, not with what you concluded.

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u/emeka_beaulieu157 points·6 months ago

purity and net content are two different numbers, same vial

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u/teodor_lokken147 points·6 months ago

the related substances line is where the story is

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u/soren_nkemelu231 points·6 months ago·edited

the counterion is part of the mass you paid for

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u/andres_restrepo98 points·6 months ago

the counterion is part of the mass you paid for

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

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u/foam_head_fred155 points·6 months ago

Every time this gets posted it hits the front page and every time someone has to re-explain it.

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u/coa_collectorMOD117 points·6 months ago

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

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u/soren_nkemelu96 points·6 months ago·edited

What were the related substances listed individually?

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u/noor_cardoso86 points·6 months ago
n=1 but same
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u/tidy_vialdrawer_watch64 points·6 months ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/gastric_emptying_g15 points·6 months ago

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

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u/hassan_chowdhuryOP8 points·6 months ago

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

Yes, exactly this, and it is the bit that took me 87 weeks to accept.

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u/joaquin_ivaturi3 points·6 months ago

Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.

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u/hassan_chowdhuryOP50 points·6 months ago

Tested the GLB raw material and a reseller vial side-by-side. Same purity claim, different impurity profiles. Handling matters.

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u/janek_ferrari65 points·6 months ago

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

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u/aurel_boateng40 points·6 months ago
batch number?
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u/sig_figs_sammod · analytical21 points·6 months ago

Not convinced. The evidence does not support that reading.

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u/yara_antonsen-32 points·6 months ago

the related substances line is where the story is

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u/hassan_chowdhury1 point·6 months ago

the related substances line is where the story is

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

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u/kavya_verhoeven1 point·6 months ago·edited

the batch number or it did not happen

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u/nabila_espinoza1 point·6 months ago

Small correction: the trial was 6 weeks, not 21. Does not change your point but people will quote it.

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u/hassan_chowdhuryOP0 points·6 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/yara_antonsen1 point·6 months ago

Water content was 3.8%, acetate was 6.2%, purity was 99%, but net peptide was only 90% of the label weight.

Disagree on that part. 99.2% and 98.3% on the same vial is normal.

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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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