Frequently asked questions
Which peptide vendor is best in 2026?
Amino Club is the Bureau’s Editor’s Pick at 4.8: it is the vendor readers actually order from, it has the lowest price per mg on most compounds the Bureau tracks, and it publishes a batch COA on every product page. Limitless Life Peptides is the runner-up at 4.5, a settled US vendor with a broad catalog. Which one suits you depends on whether price, documentation or catalog matters most.
Which peptide vendor has the lowest price per mg?
Amino Club is the lowest per mg on most compounds the Bureau tracks. PSPeptides is the cheapest per mg the Bureau tracks on large GLP vials, and Ascension Peptides has the lowest cash price on a single vial once its 50% through-the-link discount applies, with a flat $15 shipping fee and a no-refund policy.
Which peptide vendor attaches a COA to every order?
Apollo Peptide Sciences attaches the COA to every order without chasing it, at the highest per-mg cost in the set. Amino Club publishes a batch COA on every product page, and Limitless Life Peptides posts COAs on its catalog pages, so the buyer has to pull the one that matches the vial.
More vendor reviews and research
These vendors and topics are covered by the Bureau but are not in the scored table above.
- Limitless Biotech reviews: the same company as Limitless Life Nootropics?
- Peptide Partners review: the FDA warning letter, the COA database and the prices
- Direct Peptides review: four sites use the name, what each one states
- Penguin Peptides review: is it legit, prices and COAs
- Ion Peptides review: is it legit, COAs and prices
- Southern Aminos reviews: still open or closed?
- Is Core Peptides legit? Desk score 2.8: 92 lab certificates on the real store, a Finnrick record of 5 passes in 7 tests and nine look-alike domains
- Is Sports Technology Labs legit? Desk score 2.7: a seven-year-old SARMs-first store with purity-only lab reports, no Finnrick tests and look-alike stores copying its address
- Is Skye Peptides legit? Desk score 2.8: genuine lab reports, a 57% Finnrick record and two look-alike stores
- Is Onyx Peptides legit? Desk score 3.2 for Onyx Research: 25 matching lab certificates, a short history and the other Onyx stores
- Is Certified Peptides legit? Desk score 2.9: Vanguard lab reports, a 62% Finnrick record and the stores that share its name
- Is Simple Peptide legit? Desk score 3.1: 460 public certificates, a 62% Finnrick record and three live look-alike stores
- Is Modern Aminos legit? Desk score 2.7: Chromate reports, a removed Trustpilot profile and the wholesale look-alike
- Is Verified Peptides legit? Desk score 3.3: a large Janoshik library, a mixed Finnrick record and eight look-alike domains
- Is Peptide Crafters legit? Desk score 2.8: a detailed lab page, a 60% Finnrick record and the look-alike domains
- Infiniwell review
- Peptide vendors that shut down or got FDA letters in 2025 and 2026
- Peptide purity testing: how to read a COA before you pay
- Are peptides legal in the US? Federal law and all 50 states