u/honest_syringe24

Has anyone here tested that compound at all?

Spent four months confusing area% and mass% in every post I made here. One explainer thread and it clicked permanently.

Yes. Nothing here is approved for human use and that should be the first line of every thread, not the last.

Started keeping a folder of every certificate I have been sent. The ones that itemise impurities are a small group and they are mostly the same suppliers.

Spent four months confusing area% and mass% in every post I made here. One explainer thread and it clicked permanently.

the lot on the vial has to match the lot on the page

Bought small, tested identity first, and only then thought about anything else. That order felt right.

Which paper is that claim from, and was it in humans?

Storage conditions came back specific rather than generic when I asked.

This is the rule for anything unusual. Identity before anything else.

Sent one vial to Medutest and PeptideMeter. 98.4% and a claimed 97.5%. Cost me more than the vial and I would do it again.

the lot on the vial has to match the lot on the page

Did you get the chromatogram or only the summary line?

Agreed — cheap to make is a double-edged fact and it explains a lot about this corner of the market.

Disagreeing with this line: that paper is in a rodent model and it is being quoted as a human result.

Net peptide content on the certificate was well below the purity figure and both were honest.

Disagreeing with this bit: handling for one compound does not transfer to another by default.

Spent four months confusing area% and mass% in every post I made here. One explainer thread and it clicked permanently.

My first certificate had a compound name, a percentage and a logo. I thought that was normal. It is not, and now I know what to ask for.

Is water content on the document? It changes your concentration arithmetic.

Left up.

rui_only_ro is right that a pure something-else is still something else.

Right — QSC answered a handling question with actual storage conditions rather than a generic line, which is the standard.

Sent one vial to Janoshik and VendorInvestigate. 97.9% and a claimed 97.0%. Cost me more than the vial and I would do it again.

Right — CPC answered a handling question with actual storage conditions rather than a generic line, which is the standard.

What jurisdiction are you asking about? The answer has changed in several.

if nobody has tested it here, that is a fact about us, not the compound

The document I was worried about turned out to be a re-issue with a later creation date. Asked, got the original, entirely ordinary.

post the whole document, not the headline number

Cosigning. The batch identifier is load-bearing, and a certificate that cannot be tied to the vial in your hand is not about your vial.

Did you ask for the batch-specific document, or is this the catalogue one?

Area percent or net peptide content? They answer different questions.

batch number, date of analysis, method, individual impurities — that is the minimum set

gastric_emptying_g has the distinction right — one is a fraction of the detector signal, the other is a fraction of the mass.

identity before purity, every time, for anything unusual

Kept a reconstituted vial too long out of curiosity and learned something about solution stability I would rather have read.

Asked HJ for the batch-specific certificate and had the full document — batch, date, method line naming the column — inside six hours. That is now my baseline for everybody.