Last updated: June 2026 · Research use only
Short answer: Buy research tirzepatide only from a vendor that publishes a batch-specific, independent-lab COA at ?96% HPLC purity (?99% excellent) with mass-spec identity, shipping domestically. Proxiva Labs includes a COA with every order, manufactures in FDA-registered GMP U.S. facilities, and ships same-day before 4 PM EST.
What to check before you buy tirzepatide
- A readable batch COA before purchase — see How to Read a Peptide COA.
- HPLC ?96% (?99% excellent) + mass-spec identity.
- U.S. shipping and vendor stability after the 2026 Science.bio and Peptide Sciences shutdowns.
Buying from a verified source
- COA with every order, independent-lab tested (Vanguard); certificates at /test-results/.
- Same-day shipping before 4 PM EST, 2–3 business day delivery, plain-packaged + tracked, free over $150.
- FDA-registered, GMP-certified U.S. facilities.
Compare suppliers in our Best Research Peptide Vendors 2026 guide.
FAQ
What should I check on a tirzepatide COA? Batch number, HPLC purity ?96% (?99% excellent), mass-spec identity, an independent lab name, and a date.
Does it come with a COA? Yes — a COA with every order; certificates published at /test-results/.
Research-use-only disclaimer: This product is intended strictly for research and laboratory use only. It is not approved for human consumption, medical application, or diagnostic use.
All products are sold strictly for research purposes only. Not for human consumption.