Paying by card tells you two things at once: a payment processor has looked at the merchant, and you keep the right to dispute the charge if the parcel never comes.
Licensed Peptides names two accredited laboratories and keeps three separate document libraries, which puts it near the top of our index for paperwork.
Same score as everywhere else, filtered by one fact.
Licensed Peptides names two accredited laboratories and keeps three separate document libraries, which puts it near the top of our index for paperwork.
Ascension Peptides publishes two lot-level certificates per product from named laboratories, with endotoxin, sterility and heavy metals on the same document, which puts it near the top of our index for paperwork.
Core Peptides publishes exactly the kind of certificate we want every supplier to publish: lot-specific, dated, from an accredited laboratory and open to anyone.
A young Texas company with one of the largest open, dated certificate archives in this group, free US shipping on every order and a published address, phone and legal name.
Koi Peptides has a lot-searchable certificate library, two US warehouses and a retest-and-refund promise, which is most of what a lab buyer wants.
BioLongevity Labs documents its testing better than most, names three outside laboratories and keeps an open batch library with endotoxin reports.
A SARMs-first Connecticut company with two named laboratories, certificates you can open without an account and the longest money-back window in this group at 60 days.
Alpha Peptides is a 2025 start-up whose batch-coded, outside-hosted certificates are better than its age suggests.
A long-running supplier that takes cards, ships internationally and knows how to publish a proper lot-numbered certificate, then stopped doing so in 2023.
Nexaph gives kit buyers a low per-vial price, a named laboratory and a live review profile, and cannot decide whether it is a US facility or a Shanghai company.
Some of the most traceable batch certificates in this group, from a company that will not tell you its address, phone number or name.
A named operator with a street address and toll-free line, a named laboratory whose search codes you can check, and a real 30-day refund window.
Loti Labs is one of the easier suppliers to order from, with free shipping from $99, card or ACH payment and a 30-day refund on unopened product.
A capsule-heavy research-chemical store with one of the larger public lab-results pages in this group and a purity refund you could actually claim, carrying an FDA warning letter from December 2024 and a returns policy that excludes peptides and adds fees.
Open certificates from two named laboratories and free US shipping with no minimum, on a mixed SARMs-and-peptides catalog that carries a 2021 FDA warning letter, files its certificates by date rather than lot, and has no returns policy at all.
A UK SARMs-first shop with budget peptide prices, a real street address and phone, card payment and a 14-day money-back window.
A registered UK company trading since 2012, with budget GBP prices and card checkout, that openly declines to use third-party laboratory testing.
Geo Peptides has one of the lowest BPC-157 prices we recorded and almost nothing behind it: certificates without a laboratory, lot or date, a text-only phone number for contact, and a Trustpilot record dominated by orders that did not arrive.
Extreme Peptides has traded since 2010, answers a phone, takes card, Bitcoin and ACH and ships free from $99.
American Research Pens describes a thorough testing program and had not published a single lot certificate when we checked, while charging about twice what a comparable pen supplier does.
Direct Peptides offers the widest format range and the longest shipping reach in our index, backed by the thinnest testing record: one certificate image from 2023 with no lot and no laboratory, no published address, and no returns.
The main Atomik Labz site refused to load for us, and the sister storefront that did load shows prices, a crypto discount and not a single certificate, laboratory name or address.
Enhanced Peptides is easy to order from, with free shipping on every US order and three ways to pay, and impossible to audit, because its 99%+ HPLC claim comes with no certificate, no laboratory and no report.
A mixed research-chemical retailer with an FDA warning letter from September 2025, a middling independent testing record reported by Finnrick, and a website we could not load to confirm a single claim.
Card payments and a certificate page you can open without logging in, attached to certificates with no lot numbers or dates, testing done in-house, and a company that says it is registered in Panama and gives no address.
A live Trustpilot profile, a toll-free line and a stated money-back guarantee are the good news.
Premium flat pricing on pre-mixed 5 mL vials with no stated peptide content and no certificate, laboratory or purity figure behind the 'Third-Party Tested' badge.
Licensed Peptides, at 8.2 out of 10, with Ascension Peptides next at 7.5. Editorial scores from a published formula, not user reviews.
We filter the full scored list by one fact that appears on each supplier’s own pages. Nothing is reweighted for the category; the score is the same one you see everywhere else here.
Every supplier on this list sells materials labeled for laboratory research use only. We score suppliers, their documents and their policies, and we do not describe or endorse any other use.
