Independently tested · Every lot
Research peptides you can verify, from a lab you can trust.
District Purity Labs supplies analytical-grade peptides to researchers and laboratories. Every vial is tested for purity and identity, and comes with its own Certificate of Analysis.
≥98%
HPLC purity
100%
Lots tested
24h
Dispatch
Our quality process
How every vial earns its label
1. Independent testing
HPLC and mass spectrometry on every production lot by an outside laboratory.
2. Published results
The Certificate of Analysis is matched to the lot number printed on your vial.
3. Careful storage
Lyophilized, sealed and kept cold until the day your order ships.
4. Protected delivery
Discreet, padded packaging with USPS tracking from our door to yours.
Catalog
Most requested compounds
Questions
Buying with confidence
Clear answers about testing, shipping, payment and returns.
How do I know what's in the vial?
Every lot is tested by an independent US laboratory using HPLC and mass spectrometry. The lot number on your vial matches the Certificate of Analysis on the product page.
How fast do orders ship?
Orders placed before 2 PM ET on business days ship the same or next business day via USPS Ground with tracking.
Is my payment information secure?
Checkout is encrypted end to end. We never store full card numbers — only the card brand and last four digits for your reference.
What if something arrives damaged?
Open a claim from your account within 14 days and our team will replace or refund the affected items.
Affiliate program
Partner with District Purity Labs
Earn 10%, 15% or 25% on every referred sale depending on your monthly volume.