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c/coa·submitted 4 months ago by u/anya_moreau

water content — 5 things I got wrong before I got it right

COAbranch of 16 comments

Confession thread, sort of. I went from 0.25mg to 10mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 13 weeks later, at which point I had no way of knowing whether the dose increase did anything or whether it would have broken anyway. So now I have early…

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16 comments, started 4 months ago
u/sig_figs_sammod · analytical220 points·4 months ago

PDF metadata is checkable in fifteen seconds

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u/anya_moreauOP126 points·4 months ago

Small correction: the trial was 20 weeks, not 7. Does not change your point but people will quote it.

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u/stablecoin_steve86 points·4 months ago

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

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u/soren_zamora41 points·4 months ago

PDF metadata is checkable in fifteen seconds

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u/yannick_haddad22 points·4 months ago

the related substances line is where the story is

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u/andres_restrepo9 points·4 months ago

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

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u/yara_antonsen51 points·4 months ago·edited

the batch number or it did not happen

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u/vito_chowdhury33 points·4 months ago

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

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u/anya_moreauOP14 points·4 months ago

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

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u/emil_agyeman17 points·4 months ago

Water content on the document? That affects your concentration math.

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u/emeka_chowdhury100 points·4 months ago

purity and net content are two different numbers, same vial

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u/first_hundredMOD104 points·4 months ago

Tracking number removed. It identifies both ends of a shipment.

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u/katrin_girard323 points·4 months ago

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

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u/halima_boateng151 points·4 months ago·edited

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

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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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