Where to Find Quality Peptides
We don't sell peptides. What we can do is show you which vendors publish the objective signals of a trustworthy source — and teach you the checks so you can judge any source yourself, including ones we haven't reviewed.
Not an endorsement, and not medical advice. Listings are graded only on what a vendor publicly discloses (documentation, testing, labeling) — that is a transparency signal, not a guarantee of safety, quality, or legality. Research compounds are not approved for human use. You are responsible for knowing the laws where you live. We have no financial relationship with any vendor listed.
Vendor directory
Every vendor here was checked by hand. We list only vendors that meet the bar — if a source isn't here, it doesn't mean it's bad, only that it didn't clearly pass (or we haven't verified it yet). What these criteria mean ↓
Last reviewed 2026-08-04
| Disclosure | Sports Technology LabsShelton, Connecticut, US · since 2019 MZ Biolabs, Colmaric Analyticals Visit | Behemoth LabzWyoming, US (testing lab in Goodlettsville, TN) · since ~2014 Colmaric Analyticals Visit | Chameleon PeptidesOrigin Sourcing Group LLC, dba Chameleon Peptides — Sacramento, California, US Janoshik Analytical Visit | Panda PeptidesXylo Research Systems LLC, dba Panda Peptides — Fair Oaks, California, US Janoshik Analytical Visit |
|---|---|---|---|---|
| Third-party COAs | Yes | Yes | Yes | Yes |
| Batch-specific COAs | Yes | Yes | Yes | Yes |
| HPLC purity | Yes | Yes | Yes | Yes |
| Mass-spec identity | Yes | Not stated | Yes | Partial |
| Lab-hosted COA verification | No | No | Yes | Yes |
| Research-use labeled | Yes | Yes | Yes | Yes |
| Reship / refund policy | Yes | Partial | Partial | Partial |
| COAs | On product pagesVerified 2026-08-04 | View COAsVerified 2026-08-04 | View COAsVerified 2026-08-04 | View COAsVerified 2026-08-04 |
Sports Technology Labs
Publishes batch-specific third-party COAs and names its testing labs (MZ Biolabs, Colmaric Analyticals), showing both HPLC purity and mass-spec identity. Disclosed US company with a 60-day money-back guarantee and customs reship.
Note: COAs are hosted on their own site rather than linking to a lab-controlled verification page, so the reports cannot be checked independently of the vendor.
Behemoth Labz
Publishes third-party COAs on a public certificate page, tested by a named lab (Colmaric Analyticals), with HPLC purity results and batch numbers matched to each COA. Products are research-use labeled.
Note: Reship/refund is insurance-gated at checkout, mass-spec identity isn't consistently published alongside the HPLC results, and COAs are hosted on their own site rather than a lab-controlled verification page.
Chameleon Peptides
Maintains a public testing ledger of batch-specific COAs tested by a named independent lab (Janoshik Analytical), with links that resolve to the lab's own verification domain rather than a self-hosted file. Reports show HPLC purity together with mass-spec identity confirmation and the assayed amount, and each vial's batch code can be matched to its report. Discloses its company entity and a US address, and labels products for research use only.
Note: Order resolution is handled case by case rather than under a fixed policy: damaged, incorrect, missing and lost shipments are addressed on review, but no time window is stated and seized shipments aren't mentioned. Establishment date isn't disclosed.
Panda Peptides
Publishes a batch-specific COA hub tested by a named independent lab (Janoshik Analytical), with verification links resolving to the lab's own domain. Batch identifiers are matched to individual reports and HPLC purity is published consistently. States explicitly that the lab is neither owned by nor compensated based on the outcome of any result. Discloses its company entity and a US address, and labels products for research use only.
Note: Mass-spec identity is published "where available" rather than on every report, so identity confirmation is not consistent. Refund terms run on a 30-day window with reshipment at the company's discretion and generally no monetary refund; seized shipments aren't mentioned, and high-risk addresses ship at the buyer's risk. Establishment date isn't disclosed. Notably, they do commit to reship or refund if independent testing shows a product below its stated COA specification.
How this list works: it's positive-only — we publish vendors that pass the objective criteria and simply omit the rest, rather than making public claims about who to avoid. The research-peptide market moves fast, so we re-check periodically.
How to vet a peptide source
These are the criteria the table above is graded on. Each one is checkable on any vendor's own site — so if you learn nothing else here, learn these. They work on sources we haven't reviewed too.
Batch-specific COAs you can actually open
The single biggest signal. A legitimate vendor posts a Certificate of Analysis matched to your exact batch/lot, viewable without emailing them. A generic or single-sample COA reused across every batch doesn't count.
A named, independent testing lab
“Third-party tested” is claimed almost universally and means little on its own. The differentiator is naming the lab (e.g., Janoshik, Colmaric Analyticals) so the report can be corroborated.
Both HPLC purity and mass-spec identity
HPLC shows how pure the compound is; mass spectrometry confirms it's actually the compound claimed. The most transparent vendors publish both, not just a purity number.
A COA hosted by the lab, not by the seller
The strongest version of a Certificate of Analysis is one you can open on the testing laboratory's own site — some labs, such as Janoshik, publish reports at their own verification address with a unique key per test. A PDF hosted by the seller may be perfectly genuine, but you are trusting them to have uploaded it faithfully. When the document lives on the lab's domain, that trust isn't required.
A disclosed company identity
A real business entity and address — not an anonymous storefront. Vendors that hide who they are, or churn through mirror domains, are harder to hold accountable.
Clear research-use-only labeling
Honest vendors label products for laboratory research and state they are not for human consumption. Marketing that implies human use is a warning sign.
A reship or refund policy — and a track record
A stated policy for lost, seized, or damaged shipments shows they stand behind orders. Years operating on a consistent domain beats a brand-new or frequently-renamed site.
Warning signs
- “Third-party tested” claimed, but no COA you can actually open on the site.
- COAs only “available on request” or for a “random lot” — not your specific batch.
- No testing lab named anywhere.
- Anonymous seller — no company identity, entity, or address.
- Frequently changing domains, mirror sites, or a name that impersonates a defunct brand.
- Prices dramatically below everyone else, or marketing that implies human use.