The cheapest lab depends on the peptide, and the same compound can cost two to three times more at one lab than another. The tables below rank every listing by price per milligram, so a 10 mg vial and a 5 mg vial compare fairly. Prices come from each vendor’s own public product feed and refresh twice a day. Cheapest isn’t purest: we haven’t lab-tested any vendor, so check for a recent, batch-matched COA before you buy.
Checking for live vendor data.
No star ratings. We have not lab-tested any of these vendors, so any score we invented would be fiction dressed as research. What follows is only what this site can demonstrate: whether we read their public product API, when we last succeeded, how many listings we matched, and why a vendor is switched off when it is. Verify COAs, reviews, and legality yourself before buying anything.
See also: listings we refused to publish — the vendor products our identity guard rejected because they were a different compound than the one being searched for.
Prices come from each vendor’s own public product API
(WooCommerce Store API / Shopify product feed) — official, structured endpoints, not screen-scraping.
A small Node job reads them and writes assets/data/prices.json, which this page loads —
and re-checks every 10 minutes and whenever you come back to this tab, so an open page updates itself.
Refresh manually:
node scripts/refresh-prices.mjs ·
Add a vendor: node scripts/refresh-prices.mjs --probe theirdomain.com,
then enable it in scripts/vendors.mjs. A GitHub Action can run this on a schedule —
setup and the partner-terms caveats are in README.md.