I have kept every message, invoice and document, which I gather is the useful habit.
I can do the algebra. I am not confident about the conversion factors.
If there is a standard way to lay this out, I would rather learn that than invent one.
Can someone show the working rather than just the answer?
The honest answer is that splitting sealed vials is a logistics arrangement and splitting anything else is a manufacturing operation.
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 |
Keep a written record: who contributed, what was ordered, which lot arrived, how many vials each person received and when. It resolves disputes and it is the only documentation that will exist.
Carriage costs on international consignments scale far less than linearly with weight, which is the arithmetic basis for the saving.
There is no recourse mechanism in an informal arrangement. That is the risk, and it cannot be structured away entirely.
Split sealed vials only. Anything else breaks the certificate and the closure together.
edited 28 Dec 2024 by petra_hovland — expanded the table to cover the lower concentration
Aggregated, published test results and vendor ratings built from submitted batches. Methodology stated, dataset browsable, no listing fees.
Browse resultsOn the detail: document who paid what and who received what, in writing, before anything ships.
Onward distribution — even at cost, even among people who paid — may be a different legal act from personal importation in many jurisdictions. It is worth understanding the local position rather than assuming.
A first group order should be small for the same reason a first individual order should be, and the argument is stronger rather than weaker when several people are exposed.
Importer-of-record status attaches to the receiving party in most customs regimes and is not divisible among contributors.
Whoever receives it is the importer. Make sure that person knows.
edited 30 Aug 2024 by juliette_farnese — removed a claim I could not source
Ask 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.