I have kept every message, invoice and document, which I gather is the useful habit.
I can find plenty of assertions about this and almost no reasoning, which is usually a sign that nobody has checked.
Assume no laboratory access beyond what I can pay a third party for.
Which parts of this are load-bearing and which parts are habit?
The relevant point is that whoever receives the consignment is the importer, with whatever that means in their jurisdiction.
The real saving is in carriage and in unit price breaks, not in the compound itself. Carriage on a single larger consignment is typically a fraction of the sum of individual shipments, and that is where most of the arithmetic comes from.
| Step | Value | Note |
|---|---|---|
| Vial price, 10 mg nominal | £34.00 | As advertised |
| Nominal cost per mg | £3.40 | 34 ÷ 10 |
| Measured content | 9.2 mg | Independent content assay |
| Cost per actual mg | £3.70 | 34 ÷ 9.2 |
| Dead-space loss, 20 draws | 4 % | 80 µL of a 2 mL fill |
| Cost per delivered mg | £3.85 | 3.70 ÷ 0.96 |
| First vial, with £110 assay | £14.85 | Testing dominates a single vial |
More usefully, whoever receives the consignment is the importer of record in most jurisdictions, regardless of who paid. That is a legal position rather than an administrative one and it does not divide among contributors.
Carriage costs on international consignments scale far less than linearly with weight, which is the arithmetic basis for the saving.
The caveat is legal rather than analytical: onward supply is treated differently from personal importation in many jurisdictions and the difference is not a technicality.
Whoever receives it is the importer. Make sure that person knows.
edited 18 Dec 2025 by w_okoye — tightened the wording; no substantive change
Aggregated, published test results and vendor ratings built from submitted batches. Methodology stated, dataset browsable, no listing fees.
Browse resultsAsk PeptideStack is a static archive. Posting is closed, but the norms are worth stating: answer the question that was asked, show your working, cite the trial or the certificate, and say plainly where the evidence runs out.