Where to source — verified by testing
An independent, COA-first directory of peptide source websites and the third-party labs that verify them. We grade vendors on published, independently verifiable testing — list the ones that meet the bar, and flag the ones that don't. Research use only; this is editorial information, not medical advice or a purchase recommendation.
The bar to be listed.
Every vendor is graded on documentation a buyer can independently verify. To earn a Verified or Featured listing, a source must publish current Certificates of Analysis (COAs) from an independent third-party lab — not an in-house report. These are the criteria.
Independent third-party COA
Current COAs from a recognized independent lab (Janoshik, Vanguard, Freedom Diagnostics). In-house-only COAs are a conflict of interest and do not qualify.
Batch-level & verifiable
COAs carry a batch / sample ID that resolves on the lab's public verification portal — so the report provably matches the vial.
HPLC purity + MS identity
HPLC purity (research-grade typically ≥98–99%) and mass-spec identity confirming the compound is what the label claims.
Content, endotoxin & sterility
Net peptide content vs. label, plus endotoxin / heavy-metal / sterility screening where relevant to the product.
Accurate labeling & shipping
Product, strength and storage match the COA; reliable fulfillment and reconstitution guidance. Documented mislabeling or non-delivery triggers a flag.
Research-use framing
Clear research-use-only positioning and no medical claims. Vendors making therapeutic claims are not listed.
Reviewed source websites.
Search and filter peptide source websites by verification status. Featured and Verified sources meet the COA standard above; Flagged entries are sources to avoid, based on documented issues. Each card links out to the vendor and to how to verify their testing.
Affiliate disclosure: some listings carry an ATLAS referral code. When you use one you get a discount and Intrasigna may earn a commission, at no extra cost to you. Referral relationships never affect a vendor's grade or the testing standard required to be listed.
Independent verification labs.
These third-party laboratories test peptide purity and identity and publish verifiable COAs. Use them to confirm a vendor's batch — or to send your own sample. Each operates independently of the vendors it tests.
Verify before you buy.
Community reviews.
Reader reviews of source websites — delivery, accuracy vs. COA, customer service, and re-test results. Reviews are moderated before they appear and should reference a verifiable batch where possible.
Apply for a listing.
Vendors can apply for a Listed, Verified, or Featured placement. Verified and Featured require current independent third-party COAs on file. Applications are reviewed; billing starts only after approval.
A basic directory entry for sources that publish a COA.
- Name, URL, region & focus
- Publishes-COA badge
- Searchable & filterable
- Independent-tested badge
- Top placement
Top-of-directory placement with the accent edge and full profile.
- Everything in Verified
- Pinned above standard listings
- Accent-highlighted card
- Expanded profile & COA links
- Featured badge across the directory
Verified independent third-party testing on file.
- Everything in Listed
- Independent-tested badge
- Lab + batch verification link
- Full profile & review thread
- Top placement