Verdict: Purgo Labs, on the evidence: 10/10 rubric points against 9/10.
Purgo Labs: 10/10 · Trustpilot 4.7 (80 reviews) · SteriGenix · Freedom Diagnostics | Onyx Biolabs: 9/10 · 4.5 (65 reviews) · Kovera Labs · Janoshik (HCG)
Disclosure: Purgo Labs is our affiliate partner; we earn nothing from Onyx Biolabs. Scores are produced by the published rubric, which has no partnership input.
The 10 criteria, side by side
| Criterion | Purgo Labs | Onyx Biolabs |
|---|
| Names its testing laboratory | ✔ SteriGenix and Freedom Diagnostics named per lot | ✔ Kovera Labs named on all batch certificates; Janoshik for HCG (6 Sep 2026) |
| Certificates verifiable at the lab, not just the vendor | ✔ Verify-at-lab links to sterigenixanalytical.com / freedomdiagnosticstesting.com | ✔ Certificates carry Kovera-format access codes (e.g. EHNOQRS) for koveralabs.com/verify |
| Batch-specific COAs matched to lots | ✔ Lot numbers (e.g. PL-BPC-05) with test dates per batch | ✔ Per-batch certificates listed on /lab-results/ (e.g. TIR30-260901A) |
| Publishes measured net content vs label | ✔ Measured net peptide published per lot (e.g. BPC-157 lot PL-BPC-05: 11.16mg vs 10mg label) | ✔ Certificates state net content (e.g. tirzepatide 30mg batch TIR30-260901A: 99.233% purity with net-content line) |
| COAs and pricing viewable without an account | ✔ COAs on product pages without login | ✔ Catalog, pricing and certificates viewable without an account |
| Independent review base (50+ on an external platform) | ✔ 4.7 / 80 on Trustpilot (re-read 6 Sep 2026; 4.7 / 75 on 14 Aug 2026) | ✔ 4.5 / 65 on Trustpilot (verified 14 Aug 2026) |
| No contradictions among its own claims | ✔ No contradictions found across site claims (checked Aug 2026) | ✘ Not awarded |
| Vial sizes stated with prices | ✔ Product pages state vial size with price (e.g. BPC-157 10mg at $44.99; 24 dated size+price readings on record) | ✔ Sizes stated with prices (BPC-157 5mg $29.99 / 10mg $39.99, NAD+ 500 $58.99) |
| Publishes a legal entity and street address | ✔ PurgoLabs LLC (Arizona) · 10105 E Via Linda St Bld 103, Scottsdale, AZ — on-site (6 Sep 2026) | ✔ Onyx Holding, LLC · 9311 JW Clay Blvd STE 2050A, Charlotte, NC 28262 — on-site (6 Sep 2026) |
| No misleading trust signals or buyer-protection workarounds | ✔ No on-site review badge contradicting the independent record; card payment accepted; no regulator action found (checked 6 Sep 2026) | ✔ No on-site review badge contradicting the independent record; card payment accepted; no regulator action found (checked 6 Sep 2026) |
| Total | 10/10 | 9/10 |
Like-for-like prices
No compound-and-size pair with dated prices from both vendors yet.
Caveats
Purgo Labs: Smaller independent review base than several competitors (80 reviews). The catalog is peptide-focused, so researchers also working with SARMs or broader research chemicals will need a second supplier.
Onyx Biolabs: The 65-review base is still modest. Independent reviewers have questioned the >99% purity claim because the certificates are not independently verified. Multiple similarly named Onyx storefronts exist with overlapping catalogs — confirm which one you are ordering from.
Frequently asked
Is Purgo Labs better than Onyx Biolabs?
Purgo Labs, on the evidence: 10/10 rubric points against 9/10. Every point is a fact you can check on either vendor's site; both are scored by the same published rubric.
Is Onyx Biolabs legit?
Onyx Biolabs scores 9/10 on our rubric, has an independently viewable rating of 4.5 (65 reviews), and names its lab (Kovera Labs · Janoshik (HCG)). Caveat: The 65-review base is still modest. Independent reviewers have questioned the >99% purity claim because the certificates are not independently verified. Multiple similarly named Onyx storefronts exist with overlapping catalogs — confirm which one you are ordering from.
Do you earn money from either vendor?
Purgo Labs is our affiliate partner and we earn a commission on referred orders; we earn nothing from Onyx Biolabs. Scores come from the rubric, which has no partnership input.
What is the difference between Onyx Biolabs and Onyx Research?
This is the most confusing thing about the brand and worth understanding before you order. Several Onyx-branded storefronts exist — onyxbiolabs.com, onyxresearch.shop, onyxgenetics-research.com and onyx.bio. Onyx Research and Onyx Biolabs have been reported to share parent ownership while operating as separate storefronts with overlapping catalogs and identical testing claims. Each carries its own separate review history, so a rating you read for one does not necessarily describe the entity you are buying from. Confirm which storefront you are actually transacting with, particularly if you may need a refund.
Where is Onyx Biolabs located?
Onyx Biolabs states it is headquartered in Charlotte, North Carolina, and positions itself as a domestic US supplier. Purgo Labs operates from Scottsdale, Arizona. Both are US-based, so domestic fulfilment is comparable and neither involves international customs delays.
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