Best peptide vendors (October 2026)
Ranked on value from what my nightly sweep tracks: what the staples cost per mg, how much each shop stocks, whether the store stays up, and whether its prices hold still. Last check: October 31, 2026. This is a value ranking, not a quality verdict; that's the DOSE SCORE below, and it stays blank until I've tested a vendor.
Best value right now
- 1Visit →Bulk Peptides87/100 value
- 2Visit →
- 3Visit →GLPeptides69/100 value
- 4Visit →All American Aminos67/100 value
- 5Visit →MOG Labs64/100 value
- 6Visit →Arcane Peptides55/100 value
Not ranked on value
How the ranking works
Every number comes from the nightly sweep of each store's catalog. The ranking is recomputed every time that data updates, so it moves when prices move. Each vendor gets a value score out of 100:
- Price, 50%. The cheapest in-stock per-mg price on eight staples: tirzepatide, semaglutide, retatrutide, BPC-157, TB-500, ipamorelin, CJC-1295, MOTS-c. Each price is compared with the lowest any vendor charges for that compound, and the ratios are averaged. Cheapest on everything scores full marks; paying twice the lowest price scores half. A vendor needs prices on at least 4 of the eight to be ranked. What moved this week: price tracker.
- Range, 20%. How many compounds the shop has in stock, against the widest catalog in the ranking.
- Uptime, 15%. Share of the last 90 nights the store was reachable. Three failed checks in a row count as an outage. When the failure was on my side (a blocked or broken fetcher), I review it and leave it out. Every vendor's uptime and outages: vendor status.
- Stability, 15%. Half the share of the catalog in stock, half how rarely prices jump past my alert threshold in the last 60 days.
Hidden prices never count: a store that only shows prices after login, or reports a price of zero, has nothing to compare and isn't ranked. A price more than 3x the median of the other vendors for the same compound is almost always a size or unit mismatch in the listing, so it's left out rather than counted for or against the vendor.
Shopper codes: when a vendor has a discount code on its page, its prices count after that code, because that's what you'd pay. Right now that applies to RUO.bio (10%). Taking every code out changes no positions. Those codes come from affiliate programs, so here's the plain version: commission is not an input. The math never reads whether a vendor pays me or how much, and there are no paid or featured spots (how affiliate links work here).
Not in the score: payment options, shipping speed and product quality. I don't track payment methods or deliveries, and I don't lab-test vendors, so those are left out rather than guessed at.
All vendors and DOSE SCOREs
No scores yet, and that's on purpose. A DOSE SCORE lands only after I finish testing a vendor: real orders, third-party COAs, reships. Until then a vendor shows a dash, not a guess. Liveness and last-verified dates come from the nightly sweep.
