7 letters · 8 closed · 5 unverified
Suppliers to avoid, or at least think twice about
Out of the 62 storefronts we track, these are the ones with a public regulatory letter, a closed shop, or a site we could not verify. Every row links to the primary source so you can check it yourself.
Public FDA warning letters (7)
| Supplier | Letter dated | Read it | Still trading? | Our rating |
|---|---|---|---|---|
 NuScience Peptidesnusciencepeptides.com | 2026-08-24 | fda.gov | Yes | 2.8/5 |
 PureRawzpurerawz.co | 2025-09-08 | fda.gov | Yes | 2.1/5 |
 Xcel Peptidesxcelpeptides.com | 2024-12-10 | fda.gov | Yes | 2.1/5 |
 Swiss Chemsswisschems.is | 2024-12-10 | fda.gov | Yes | 3.0/5 |
| Prime Peptidesprimepeptides.co | 2024-12-10 | fda.gov | Yes | 3.0/5 |
 Umbrella Labsumbrellalabs.is | 2021-05-18 | fda.gov | Yes | 3.0/5 |
| Paradigm Peptidesparadigmpeptides.com | 2020-12-07 | fda.gov | Closed | Not rated |
Editorial ratings, not user reviews.
Closed storefronts (8)
- Chemyo (chemyo.com): Homepage and about page now show only a closure notice: Chemyo LLC permanently closed September 8, 2026, fulfils pre-closure orders, takes no payments, and warns of impersonator sites with a report tool. No historical catalog, testing, location or pricing data could be verified (archive access unavailable; Finnrick has no vendor page; Trustpilot returned HTTP 451). No FDA warning letter naming Chemyo was found.
- Paradigm Peptides (paradigmpeptides.com): Legal entity Paradigm R.E. LLC (paradigmpeptides.com), owned by Matthew Kawa. Homepage returns 403 and CBS News reports the business shut down in March 2024; all profile data comes from FDA, DOJ and news sources. Kawa pleaded guilty (2025-12-10) and was sentenced 2026-07-30 to 70 months for selling unapproved drugs including BPC-157 and testosterone-adulterated 'SARMs' imported from China/India, with forged lab certificates despite advertising '99% purity and third-party lab testing'; customers were in all 50 states and 80 countries (April 2019 to March 2024). The hyphenated paradigm-peptide.com (Finnrick: separate, recent, privacy-protected domain) and paradigmpeptides.is are distinct operations and not profiled here.
- Peptide Sciences (peptidesciences.com): Not operating in 2026: multiple independent write-ups report that peptidesciences.com replaced its store with a voluntary-shutdown notice at about 2:00 PM ET on March 6, 2026; the homepage returned HTTP 403 on 2026-10-19 and the Trustpilot page returns HTTP 451. Pre-closure details (Henderson, NV address, 100+ product catalog, payment methods, COA-per-batch claim, 2023 FDA letter) come from a single secondary article (ThePeptideList, which runs a competing directory) and were not verifiable on the vendor site. No pricing or testing fields could be verified.
- Proven Peptides (provenpeptides.com): Confirmed closed: provenpeptides.com returns HTTP 522 on every attempt and no live storefront exists. A review site (peptidedossier.com) states the vendor operated roughly 2012-2024 and went offline in late 2024 without notice; it cites no primary evidence. No FDA warning letter addressed to Proven Peptides was found in search results. All catalog, pricing and testing fields are unknown because the site cannot be fetched and the Wayback Machine is blocked in this environment.
- Rats Army (rats.army): The domain loads only a parked placeholder, so the store is gone. A January 2022 third-party review page (which promotes Sports Technology Labs) carries a note that Rats Army closed in April 2022, locates it in Kalispell, Montana, and describes a SARMs/prohormone/peptide catalog with free US shipping over $99 and a money-back guarantee; none of this could be verified from a primary source. Location fields are from that page only. No FDA warning letter naming Rats Army was found; Reddit presence noted via r/sarmssourcetalk citations on the same page.
- Science.bio (science.bio): Confirmed closed: science.bio now shows only a notice that the company decided to permanently close and discontinue the sale of research products, with no date given. Finnrick's June 13, 2026 vendor report places the final shutdown in January 2026, cites California correspondence addresses and a North Las Vegas import footprint (no HQ stated), found no public FDA warning letter, and records a 42% pass rate across 12 tests. Historical catalog, testing and pricing could not be verified (archive access unavailable).
- Strate Labs (stratelabs.ca): Canadian research-chemical vendor (per Peptide Protocol Wiki, last verified 2026-02-11) that ran parallel .ca and .is storefronts and sold peptides, SARMs, capsules and topicals with free domestic shipping over CAD 250. As of 2026-10-19 the .ca domain no longer resolves and the .is domain redirects to GL Peptides, consistent with community reports of a mid-2026 closure, so status is recorded as closed. The wiki records a May 2024 default judgment in an Eli Lilly civil action and an ITC investigation. No COA, pricing or payment details could be verified on a vendor page.
- Swole AF Labs (swoleaflabs.com): The Swole AF Labs storefront no longer exists: swoleaflabs.com permanently redirects to rcs-research.is, a gated 'RCS Research' site that shows only login/application forms, a US-based-support claim, 'Since 2018', an RUO disclaimer and a help@ email, and does not mention Swole AF. Third-party blogs say the brand became SAF Research/SAF Peptides and disagree on whether it is US- or UK-based; the publiclab.org post cited for this returned 404. The RUO disclaimer and 21+ gate recorded here belong to the redirect target. No FDA warning letter naming Swole AF Labs was found (a 2022 letter to Steel Supplements covered unrelated '-AF' supplement names).
Could not be verified (5)
- American Research Labs (unknown): Could not locate an operating website. The two candidate domains (americanresearchlabs.com, americanresearch.net) both redirect away to unrelated pages, and the only vendor descriptions come from an affiliate listing (Outliyr, 1.8/5) and Trustpilot regional pages for americanresearch.net that mention third-party lab reports. Treat as unverified/possibly defunct; all catalog, pricing and testing fields are unknown. Not to be confused with American Peptide Company (americanpeptide.com, an Otsuka subsidiary).
- Apex Peptides (apexpeptides.com): Could not be verified: apexpeptides.com served a maintenance page and apexpeptides.org (the domain listed by Peptide Protocol Wiki, last verified 2026-02-19) returned 403. The wiki describes a US-only, card-only vendor with 7 listed peptides and HPLC COAs from unnamed 'accredited US laboratories'; the product list above is the wiki's, not the vendor's. Multiple unrelated 'Apex Peptides' domains exist in other countries, and the one Trustpilot profile found (apexpepts.com) has been removed. Status left unknown.
- Arctic Peptides (arcticpeptides.com): Homepage, product pages and products.json all return a Cloudflare 403 block; the domain still resolves (Cloudflare IPs) so the site appears to exist, but current trading status could not be confirmed. Everything here comes from the unclaimed Trustpilot profile (2.6/5, 10 reviews, last Oct 2024) and one third-party review article (millennialhawk.com), which says the vendor claims 99%+ purity verified by two independent labs and sells BPC-157, TB-500, Ipamorelin, CJC-1295 No DAC, semaglutide and retatrutide. No FDA warning letter naming Arctic Peptides was found in search. Not the same business as Arctic Labs (arcticlabs.co) or Arctic Lab Supply (arcticlabsupply.com).
- Canada Peptide (canadapeptide.com): No vendor site named exactly 'Canada Peptides' was found; canadapeptides.com returned HTTP 523 twice and canadapeptide.com (Canada Peptide, the vendor named in the Health Canada advisory) returned HTTP 403, so all vendor-side fields are unverified and fetched_ok is false. The only official record is Health Canada's 2025-08-01 public advisory on unauthorized injectable peptides seized from and sold by Canada Peptide; the advisory does not name the domain, but CP24's report links it to canadapeptide.com. A 2018 Podbean page describes Canada Peptide as a division of a Montreal biotech company; peptideprotocolwiki reports Canada-only shipping, credit-card payment, free shipping over $400 CAD and in-house HPLC/MS reports; none of this was verifiable on the vendor site so it is kept out of the structured fields. Formats set to vials only because Health Canada describes the products as injectable.
- Narrows Labs (narrowslabs.com): The domain narrowslabs.com (WHOIS: registered 2017-03-29 via GoDaddy, status clientDeleteProhibited/clientRenewProhibited, updated 2026-08-15) currently serves only a redirect stub to router.parklogic.com, a domain-parking service, and the www host fails TLS. No vendor pages, COAs, pricing or contact details could be read, and no Trustpilot, Reddit, Finnrick or FDA records naming Narrows Labs were found before the search budget ran out. The brand appears inactive or parked as of 2026-10-19; status left as unknown because closure was not confirmed by any source.
Warning signs we watch for
Paperwork
- No certificate of analysis anywhere, or one undated "sample" certificate copied across the whole range.
- A certificate with no laboratory name, or a laboratory that only exists on the supplier's own site.
- A footer that says "mass-spec verified" when the posted certificates show something else.
The company
- No business name, address or phone; only a contact form.
- A trust-site profile that was taken down for breaking the platform's rules.
- Checkout limited to payment methods you cannot reverse: crypto, wire, peer-to-peer apps.
The marketing
- Product pages making health claims while the footer says "research use only".
- Review counts shown on the storefront with no platform you can visit to read them.
The record
- A public FDA warning letter, whatever the supplier's reply.
- A domain that recently changed hands or now redirects to a different brand.
Questions buyers ask
What is an FDA warning letter, in plain terms?
It is a public letter in which the US Food and Drug Administration tells a company it believes the company is breaking the law, usually naming specific products and web pages. It is not a court ruling, and the company can reply and keep trading. We record the date and link straight to the letter on fda.gov so you can read it yourself.
If a supplier has a letter, are its products bad?
The letter does not tell you that. In this category the letters mostly deal with how products are described and marketed. We treat one as a serious mark against a supplier because it is public, dated and written by a regulator, and because it caps the rating at 3.0 stars, not because we have tested anything.
Why list suppliers that have closed?
Because old forum threads and comparison lists still send people to them. A clear "closed" page with a date stops a reader from paying a dead storefront, or whoever picked up the domain afterwards.
What does "could not verify" mean?
The site was offline, redirected somewhere unrelated, or showed nothing we could check when we looked. We do not rate those suppliers and we suggest you treat them as unknown until something changes.