u/yannick_haddad

What is protein intake actually looking like, measured rather than estimated?

do not post your own address details when asking

Ordered from the warehouse in New Zealand and the whole import question disappeared. 10 days, domestic, no notice, nothing to manage.

Yes. Nobody here is prescribing training or nutrition and the good posts say so.

UV at 214nm sees the peptide bond and picks up almost everything; at 280nm you are looking at aromatics only. Which wavelength the number came from is part of the number.

Right — strength retention is a free proxy and it tracks better than most people expect.

Right — strength retention is a free proxy and it tracks better than most people expect.

That is not what the method line says. It names the technique; it does not certify the operator.

water content is on there and everyone skips it

Started weighing protein rather than estimating it. The gap between what I thought and what I ate was embarrassing.

Small fix — those rules apply to commercial import. Personal import is governed separately and more narrowly.

LC-MS gives you identity; UV purity gives you a relative quantity. A document with the first and not the second, or the reverse, is answering half the question.

Compared two scans from different clinics and panicked over a difference that was inside the error margin.

Same view. GGPeps prints the column and the gradient, which means somebody could actually reproduce the run.

axis labels included, always

Careful — "the metadata looks odd" is a reason to ask a question, not a conclusion. Re-issues are ordinary.

Import rules are national and they distinguish between personal and commercial import, with different thresholds, documentation and consequences. A general answer is almost always wrong somewhere.

resistance training first, cardio if there is time left

The rules where I live changed between two orders six months apart. Nothing was announced; I found out by reading.

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.

Related substances itemised individually is a much stronger document than a single total, because it tells you the shape of the impurity profile rather than its size.

Right, and net peptide content is where the counterion and the water go. Both numbers can be honest and very different.

Agreed — the itemised related substances table is the difference between a document and a receipt.

Yes. The structure of the document matters at least as much as the number printed on it.

Area percent is the peak area of your compound over the total integrated area, at one wavelength, on one gradient. It is a relative measure of what the detector saw, not a mass fraction of the vial.

Does the lot on the vial match the lot on the page?

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

Small fix — 214nm, not 280nm. It matters here because the impurity you are asking about barely absorbs at the longer wavelength.

Yes.

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

the counterion is part of the mass you paid for

Water content 3.8%, acetate 6.2%, purity 99%, net peptide about 90% of label weight. All four numbers honest, and I had to read it twice.

ask the supplier what documentation accompanies the shipment

I would not read a rounded figure as evasive.

Adding the bit that always gets missed: the lot on the vial has to match the lot on the page, or none of this applies to your material.

I would not read a rounded figure as evasive. Plenty of documents round to one decimal as house style.

This. Area percent answers "what fraction of what the detector saw was the peak I wanted", and people read it as "how much peptide is in the vial".

Small fix — 214nm, not 280nm. It matters here because the impurity you are asking about barely absorbs at the longer wavelength.