How PeptidesGrid works

What is compared

Every price on PeptidesGrid is a public list price read from the vendor's own store on the date shown. For the 39 stores that publish a standard product feed (WooCommerce or Shopify) we read the feed directly, including every size and pack option. For the rest we read the product pages. We never log in, never add to a cart and never use prices sent privately.

Each listing is matched to one of 34 peptides and then reduced to one number: US dollars per milligram, the listed price divided by milligrams per vial times vials in the pack. That puts a single 5 mg vial and a 10-vial kit of 10 mg on the same scale.

What is left out

Capsules, tablets, nasal sprays, pre-filled pens, pre-mixed liquids, creams, raw powder and anything that is not a lyophilized vial. Blends are compared only against the same blend (GLOW, KLOW, BPC-157 + TB-500, CJC-1295 + Ipamorelin, CagriSema); other mixes are left out. A listing is dropped when its size can't be read from the name, the option label or the product URL. Product descriptions are used only as a last resort, because vendors often copy them between sizes.

Several vendors sell GLP-class peptides under code names: "GLP-1 (S)" is semaglutide, "GLP-2 (T)" is tirzepatide, and "GLP-3 (R)" is retatrutide. PeptidesGrid files them under the real name.

Flagged prices

This market has two tiers. Factory-direct sellers mostly sell 10-vial kits at a fraction of the per-mg price of US resellers selling single vials. Both are real. A listing is only flagged "check listing" when it sits far outside both tiers: under a third of the 10th percentile or over three times the 90th percentile for that peptide. Flagged listings stay visible but don't count toward the low and median figures.

Lab ratings

Lab data comes from Finnrick, an independent US lab that tests samples bought and submitted by customers. PeptidesGrid shows only what Finnrick publishes openly on each vendor's profile page and links back to it. The rating shown is Finnrick's "Purity focus" rating: the share of classifiable tests passing at 99.5% purity or better with a measured dose within 35% of the label, adjusted so a vendor with few tests doesn't look more certain than it is. It is not a raw pass rate. On peptide pages the rating is Finnrick's rating for that peptide at that vendor when it exists.

A rating describes past samples, not the vial you would receive. A missing rating means no classifiable tests yet.

Which store belongs to which vendor

Lookalike domains are common in this market: one letter off, a different ending, or a copied catalog. So a vendor's lab rating is only shown next to prices from a domain that Finnrick lists for that vendor. A store on any other domain appears under its own domain name, marked "unverified", with a note saying which brand it claims to be. Some of those are a vendor's second site and some are not; PeptidesGrid doesn't guess.

Stores that show prices only to logged-in members are listed without prices, because those prices aren't public. Stores that have closed, stopped selling or are flagged as fraudulent are listed without prices or links.

Every domain has its own store page with one of four verdicts. Verified: Finnrick lists the domain for the vendor that runs it, or a domain it lists vouches for it (a redirect, for example). Unverified: the store uses a vendor's name on a domain Finnrick doesn't list for it, or isn't tied to a rated vendor. Shared: Finnrick lists the domain for more than one vendor and it isn't clear which runs it. Flagged: Finnrick or the vendor itself names the domain as fraudulent or fake; this beats any other verdict.

Policies

Shipping origin, destinations, payment methods, COA availability and guarantees are taken from each vendor's own public pages and cited on the vendor page. Blank means we couldn't verify it, not that the vendor doesn't offer it.

Warnings

Where Finnrick notes fraud, imposter domains or a closed business, PeptidesGrid repeats the note on the vendor page. For vendors whose listed site is flagged as fraudulent, or which have stopped trading, no prices or store links are shown.

Independence

No vendor pays for placement, ranking or removal, and PeptidesGrid uses no affiliate links. Sorting is by the numbers in the table, nothing else.

Legal

Vendors sell these compounds as research chemicals, not for human use. PeptidesGrid is a price and data reference, not medical advice, and doesn't sell anything. Prices, stock and policies change without notice; always confirm on the vendor's site.

Last price check Sep 25, 2026. Exchange rates: ECB via Frankfurter, Sep 25, 2026.