Find the peptide vendor that actually earns your trust.
A published, weighted scoring model built from public lab documentation, live catalog pricing, and community sentiment — not first-hand testing. Every vendor is graded on the same rubric — no vendor wins every category.
13 vendors ranked · published methodology · updated monthly
Top vendors
Updated Aug 2026
One Tap Peptides7.8
Pure Rawz7.7
Protide Health7.5We may earn a commission when readers buy through links on this page, at no extra cost to you. Commissions never affect a vendor's score — every vendor is graded on the same public rubric built from published lab documentation, live catalog pricing, and community sentiment. How we score →
13
vendors scored
6
weighted factors
51
state guides
20
compound profiles
389
cited sources
Monthly
re-review cadence
Top-rated vendors right now
Full rankings →One Tap Peptides
7.8
/ 10 overall score
Researchers who want batch-level documentation and a modern, transparent storefront
Check pricePure RawzResearchers who prioritize named, batch-level third-party lab verification and don't mind slower standard shipping
Protide HealthResearchers who want a named, look-up-able third-party lab and fast US shipping without paying a premium
PeptidologyResearchers who want a named third-party lab and strong direct customer reviews, and don't mind creating an account to see live pricing
Ascension PeptidesUS-based researchers who want a modern, batch-documented storefront and are comfortable with a newer vendor's shorter track record
Category winners
Same scoring dataset, reweighted for what matters most to different researchers. No vendor wins every lens.
Recently shut down
This category has seen 4 high-profile closures in the past two years. None of these vendors are ranked above — here's what happened.
Amino Asylum
Closed 2025-06-18A Texas-based vendor known for aggressive pricing and a very wide catalog spanning peptides, SARMs, and nootropics; reportedly one of the top five most-searched peptide vendors in the US prior to the raid, with 400,000+ monthly site visitors.
Paradigm Peptides
Closed 2024-03Marketed itself as 'made in America' with 99% purity and third-party lab testing while prosecutors say it was actually importing untested products from Asia; now a cautionary case study cited across the industry (and referenced in the DOJ's Northern District of Indiana press release) for false US-manufacturing and false lab-testing claims by a peptide/SARMs vendor.
Peptide Sciences
Closed 2026-03-06The largest and longest-running US research peptide vendor by revenue (an estimated $7.4M in online sales in December 2025 alone per Grips Intelligence), broad catalog, and being a default recommendation across the research-peptide community for over a decade before its abrupt shutdown.
Science.bio
Closed 2026-01-27A well-regarded US supplier of research chemicals, nootropics, SARMs, and peptides known for a broad catalog and a relatively clean reputation prior to its voluntary closure — one of at least eight major vendors (alongside Peptide Sciences, Amino Asylum, Paradigm Peptides, Royal Research, and others) to exit the market in the ~9 months surrounding this closure.
Compound research, honestly grouped
AOD-9604
A 12-week Phase IIa trial (300 participants) reported a modest but statistically distinguishable weight reduction (2.6 kg vs. 0.8 kg placebo), which supported advancement to Phase IIb.
BPC-157
A 2010 study reported that BPC-157 promoted tendon outgrowth, fibroblast survival, and cell migration in an in vitro/rat tendon explant model.
Cagrilintide
REDEFINE 1 (N=3,417) reported that adults taking CagriSema lost an average of 23% body weight under the treatment-effect (on-treatment) analysis at 68 weeks.
CJC-1295
The 2006 Teichman study reported that a single CJC-1295 injection produced dose-dependent increases in mean plasma GH concentrations by 2- to 10-fold for 6 or more days, and IGF-1 concentrations by 1.5- to 3-fold for 9-11 days.
Epithalon
A 2003 in vitro study reported that Epithalon induced telomerase activity and telomere elongation in human somatic cells — the foundational finding underpinning most subsequent interest in the peptide.
GHK-Cu
A randomized trial on CO2 laser-resurfaced skin found topical GHK-Cu produced no statistically significant objective reduction in erythema or improvement in wrinkles versus controls, though patient-reported satisfaction was significantly higher in the GHK-Cu group.
Browse by state
Legal status notes, enforcement activity, and metro-area context for all 51 state guides.
See all 51 states →Latest from the blog
All posts →How to Read a Peptide COA (Certificate of Analysis)
What a real peptide COA actually shows, what counts as genuine third-party testing, and how to verify a Janoshik report on their public portal.
Peptide Sciences Shut Down: A Timeline of What Happened
A factual timeline of Peptide Sciences' March 2026 closure, the enforcement pressure that preceded it, and where researchers have migrated since.
The 2025-2026 Peptide Vendor Closure Wave, Explained
Peptide Sciences, Science.bio, Amino Asylum, and Paradigm Peptides all exited within two years. What happened at each, and why due diligence now matters.
How we score
Every vendor is scored on six weighted factors — built entirely from publicly available data. We never place test orders or claim first-hand testing.
Compound research overviews for 20 peptides
Research status, published timeline, active studies, and safety notes for every compound we cover — honestly grouped, from FDA-approved drugs to early preclinical research chemicals.
Frequently asked questions
How does Best Peptide Stores make money?+
We earn commissions when readers purchase from vendors we link to. Compensation never affects a vendor's score — see our affiliate disclosure for the full picture.
Do you test the peptides you rank?+
No. Our methodology is public-data desk research: we audit published certificates of analysis, catalog pricing, shipping and refund policies, and public community sentiment. We do not place test orders or perform in-house lab testing.
Does a vendor you're paid by always rank #1?+
No. Every vendor, including ones we earn a commission from, is scored on the same rubric and none of them wins every category — see the comparison table on the flagship rankings page for category-by-category results.
How often are rankings updated?+
We re-review published COAs and community sentiment on a quarterly cadence, with updated-date stamps shown on every money page.