Every price, after the code, size for size.

Every price is the vendor's listed price with its public code applied, for one unit. Shipping, tax, payment fees and order minimums are not included; the vendor's checkout decides those.

Prices are compared by the size the vendor lists, 10mg with 10mg. Blends, packs and capsules are never mixed with single vials.

GigaCompounds lists a lower per-vial price at ten vials. We show the single-vial price and label the ten-vial price separately, so the two are never confused.

Once a day, every price on the site is compared with the vendor's own feed, and GigaCompounds' with its product pages. A price that matched carries "Verified today"; one that did not (usually a feed that moved after the check) goes on a list for us to review and shows no badge until it matches again.

GigaCompounds' and Instant Peptides' product feeds are read every ten minutes, around the clock. A row holds the price, size, code, stock and the time it was seen.

When a feed's details conflict, for example quantity pricing that does not match the product page, the price is held off the site until it has been checked. The peptide then shows "Price under review" instead of a figure.

We also read the listed prices of more than a dozen other research-use peptide stores every hour. They are counted in the comparison and never named or linked.

We read prices from hundreds of US research-peptide stores, and compare against a panel of the largest: the 12 that stock the most of the sizes our two vendors list, never named. For each listed size that at least three panel stores have in stock, we take the middle price across them. Our two vendors are never counted inside that figure, so a verdict compares a vendor with other sellers, not with itself.

A vendor price 5% or more under what most stores charge is a Good price. Within 5% either way is a Fair price. Above that is Above market. When fewer than three stores list a size there is no verdict, and the price shows without a chip.

The lowest recorded price per size is kept day by day. "Lowest recorded" marks a price at its lowest since we began reading it; recorded drops, restocks and sales are listed on the homepage.

Codes on file are shown next to the prices they set. Their terms are the vendor's; GigaCompounds' code works once per account.

Sales come from vendor feeds and vendor posts, with the prices we recorded while they ran. They end when the vendor ends them.

Every vendor link is a paid affiliate link and may earn PeptideSpend a commission at no extra cost to you. The commission never changes a price or a verdict.

Prices, vendor links and codes show for signed-in members. An account is free: an email address and a password. Favorites follow you to any device and can email you when one drops.

We may report testing or certificate claims as vendor-stated facts. We do not test products, certify products or verify certificates of analysis.

We do not sell, ship or handle products, and nothing here is guidance on use. Everything listed is for laboratory research use only.