Prices are read automatically from public storefront data — the same product and pricing information any visitor can see without an account. We read three sources: a shop’s public product feed, its public store API, or the structured product data embedded in its own product pages. We check each tracked shop daily.
No price on this site is ever typed in by a human. Not to seed a page, not to fix a single row. The moment a person types a price, that figure stops being evidence and starts being an assertion, and there is no way to tell the two apart later.
Because shipping is excluded, we never claim an offer is the lowest price obtainable anywhere. The lowest figure on a page is the lowest of the sources we track — a narrower claim, and the only one the data actually supports.
Price divided by the total milligrams in the unit sold. We only rank single units, so a listing has to state a dose we can read unambiguously. If a title gives a concentration and a volume, we multiply them; if it gives a concentration with no volume, we do not guess — the listing goes to review instead of onto a page.
We never rank across product formats. A milligram is a milligram, so the arithmetic is valid between a capsule and a vial — but they are not substitutable purchases, so they never share one ranked list. Bulk raw material is treated as its own format for the same reason.
Products that combine two or more compounds are never assigned to one of them and never appear on a compound’s price page.
We currently list US dollar prices only. Where a storefront prices in another currency we skip it rather than convert, because a converted figure is a snapshot of an exchange rate rather than a price you can pay.
Every row shows when we last verified it. A price we have not been able to confirm for seven days is removed from the page rather than shown with a warning. The risk we are managing is not that a price drifted — peptide prices move slowly — it is that the shop is gone. Sending someone to a dead storefront is worse than showing them one fewer offer.
When a product disappears from a shop’s catalogue we remove it immediately, because that is something we know rather than something we failed to check.
A compound needs at least three live offers before it gets a price page, and it needs a substantive guide for the page to link to. Both are automatic conditions, not a hand-maintained list.
If a price shown here is wrong, or you operate a shop and want it removed from collection, contact us and we will correct or remove it. Our collection practices are described in full on the crawl policy page.