Onyx Biolabs is a US-based research-peptide supplier operating out of Charlotte, North Carolina, with a brand built almost entirely around one message: prove the purity, don't just claim it. Every lyophilized vial in their catalog is designated strictly for in-vitro and laboratory research use — not for human consumption, animal use, or as a dietary supplement — and the company positions itself squarely against the "under-dosed vials and fake lab reports" that plague this market.
What stands out is how much of their quality story is independently verifiable. Onyx sends every batch to an independent lab (they name their testing partner, Kovera Labs) for both High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry, publishes the certificates on a public lab-results page, and states their COAs test not just for purity but for exact net content — a direct answer to the industry's under-dosing problem. They also carry third-party "Verified by Metrix" seller verification and hold a 4.6-star Trustpilot rating across 51 reviews that repeatedly praise transparency, fast domestic shipping, and responsive US-based support. Their catalog leans heavily into the GLP-1 research class — Retatrutide, Tirzepatide, and Semaglutide — alongside the usual recovery, longevity, and growth compounds.
Affiliate disclosure: the links on this page are affiliate links. If you purchase through them, Peptides Uncaged may earn a commission at no extra cost to you — it never changes our scoring. All products are for laboratory and research use only, not for human consumption.
Short answer, based on our review criteria: yes — Onyx Biolabs is a legitimate, transparency-focused research-peptide supplier with unusually strong, verifiable quality documentation. Here's what stands behind that:
A few honest things to know before ordering: Onyx is a newer operation (the brand launched in 2025), so it has a shorter track record than veteran vendors — the verifiable COAs and Trustpilot volume offset a lot of that, but it's worth knowing. Phone support is text-only, purchases require you to be 21+, catalog pricing often reflects active sales (so the "from" prices below can move), and all products are strictly for in-vitro research use only. None of that is unusual for this space.
A selection of their most popular research compounds — with a deep GLP-1 lineup. Click any product to view it on Onyx's site; your order ships directly from them. Prices reflect current listings and change with active sales. Strictly for laboratory and research use — not for human consumption.
Showing 6 of a broad research catalog. Prices are starting points and change often with active sales. Every buy link is an affiliate link, disclosed per FTC guidelines. For laboratory and research use only — not for human consumption.
Yes. Based on our independent review, Onyx Biolabs is a legitimate, transparency-focused US research-peptide supplier. What separates them from the pack is that their quality story is independently verifiable: every batch is tested by a third-party lab they actually name (Kovera Labs) using both HPLC and Mass Spectrometry, and the certificates are published on a public lab-results page — not "available on request." Their COAs verify exact net content too, a direct answer to the under-dosing problem in this market. Add Verified by Metrix seller verification and a 4.6-star Trustpilot rating, and Onyx earns a confident yes.
Onyx Biolabs holds a 4.6-star Trustpilot rating across a large volume of reviews, and the themes repeat again and again: transparency (public third-party COAs you can actually check), fast domestic US shipping, careful cold-chain packaging, and responsive US-based support — reviewers frequently name the specific staff who helped them, which almost never happens in this industry. Our own editorial review reaches the same conclusion: Onyx is our COA-transparency and GLP-1 pick for 2026.
In their own words, Onyx built the company against the "under-dosed vials and fake lab reports" that plague this market — and then backed it up with process. They prove purity instead of claiming it: independent HPLC and Mass Spec on every single batch through a named lab, public certificates of analysis, and net-content verification so you know a 10mg vial actually contains 10mg. Most vendors do one of those things; Onyx does all three. That's about as much proof as this market offers, and it's why they've built a 4.6-star reputation in a short time.
Yes — every batch goes to Kovera Labs, an independent testing partner, for both High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry. The resulting COAs are posted publicly on Onyx's lab-results page and verify identity, purity (99%+), and exact net content.
Fast — inventory is climate-controlled and ships from their US facility in Charlotte, North Carolina, with free standard ground shipping on research orders over $200. Fast domestic delivery is one of the most-cited positives in their Trustpilot reviews.
Yes — take an extra 5% off when paying by Zelle, Cash App, or bank transfer, and their catalog pricing frequently reflects active sales (GLP-1 research compounds like retatrutide start around $43.99).
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Answers reflect Onyx Biolabs' own stated policies and our independent review criteria. Affiliate links disclosed. For laboratory and research use only.