Suppliers that list several peptides blended in one vial.
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.
Paramount Peptides offers a named laboratory, a lot-numbered certificate and more than twelve years in the business, with a claim of in-house synthesis that few rivals make.
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.
BioLongevity Labs documents its testing better than most, names three outside laboratories and keeps an open batch library with endotoxin reports.
Evolve Peptides names three laboratories, shows lot-specific certificate and endotoxin images on the product page and backs purity with a 200 percent guarantee.
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 Labs Peptides pairs some of the lowest vial prices in our index with an open, dated certificate library that reaches into endotoxin and sterility.
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.
Biotech Peptides puts a lot-numbered, dated certificate from a named laboratory on its product page, which is more than most suppliers manage, and then tells you almost nothing about the company, the carriers or how to pay.
Some of the most traceable batch certificates in this group, from a company that will not tell you its address, phone number or name.
Liberty Peptides shows you purity and endotoxin figures for 71 samples and never tells you which laboratory produced them.
The best-linked certificates in this group, straight from the product page to Janoshik's own verification record, paired with an independent record in which half of Finnrick's tests failed and a company that publishes no address, phone or owner.
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.
One of the better certificate libraries in this group and a genuine 30-day return window with a prepaid label, weighed against an FDA warning letter from December 2024 whose named products are still on the shop page.
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.
Blue Sky Peptide is a long-running budget supplier with a free certificate library and one of the lowest free-shipping bars we have seen.
Limitless Biotech publishes something rare, per-lot certificates with sterility and endotoxin results, and then hides its prices behind an application, names no laboratory, and keeps its address and phone off its own site.
NuScience Peptides received an FDA warning letter dated August 24, 2026, and the address on that letter is not the one on its website.
A UK SARMs-first shop with budget peptide prices, a real street address and phone, card payment and a 14-day money-back window.
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.
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.
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.
Everything you would want to check before a first order, from prices to certificates to payment methods, is hidden behind a login, and what you can see from outside does not read well.
Some of the lowest prices in this group and next-day Royal Mail delivery, attached to a storefront that names no laboratory, no company, no email and no phone, takes bank transfer only, and has lost its Trustpilot profile.
Elite Peptides is cheap and quick to ship, and there is nothing behind it that a buyer can check: no certificate, no laboratory, no email, no phone and no address.
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.
