Peptide Sciences review: closed, and why that matters

What happened

Peptide Sciences, which operated from Henderson, Nevada, is closed. Several independent write-ups report that the store at peptidesciences.com was replaced by a short voluntary-shutdown notice at about 2:00 PM Eastern on March 6, 2026. When we tried the homepage on October 19, 2026 it returned HTTP 403, and the company’s Trustpilot page returned HTTP 451, which means it is unavailable for legal reasons. There is no live store, no published way to reach support and no stated path to a refund for anyone who had an order open at the time.

Peptide Sciences closed on March 6, 2026 and is not taking orders

Because the site did not load during our check, we could not verify a single testing, certificate, pricing, shipping or payment field. Everything we know about the company before the shutdown comes from secondary sources, and we say so where it matters.

What the record still shows

Before it closed, Peptide Sciences carried a catalog of around 100 products, including GLP-class products, and according to ThePeptideList it accepted Venmo, Zelle, Cash App, crypto and cards. ThePeptideList runs a competing directory, so weigh its account with that in mind. The same source says the registered address was a virtual mailbox at a coworking center, that the about page claimed a 1990 founding while the domain was registered in December 2009, and that a 2023 FDA warning letter over health claims existed. We could not confirm that letter against fda.gov within this research, so we do not treat it as established.

On testing, Finnrick, an independent testing aggregator, is reported by ThePeptideList to have given one of the company’s GLP-class products its lowest rating across 34 samples, with the latest test on August 4, 2025, quantities reportedly up to 50% below label and one misidentified sample. That is a third-party report relayed through another third party, not our finding, and we could not check it against a vendor certificate because none could be loaded.

If you still see it recommended

Peptide Sciences was a fixture on older “best supplier” lists and in forum threads, and many of those pages are still live. Every one of them predates March 2026. If you follow one of those links today you will find a shutdown notice or an error page, not a checkout, and if you had an order outstanding your only route is your card issuer or payment provider, since the company published no refund plan.

When you pick a replacement, look for what could never be verified here: a live certificate library with a named laboratory, a street address you can write to, and a returns policy you can read before you pay. A supplier that publishes all three leaves you with more than a dead URL if it ever closes its doors the way this one did.