I sent tirzepatide samples from 5 different vendors to an independent analytical lab. Results (purity %): Vendor A: 99.1%, Vendor B: 97.3%, Vendor C: 95.8%, Vendor D: 89.2%, Vendor E: 82.5%. Vendors D and E are clearly cutting corners on synthesis or purification. Will not be naming vendors publicly but happy to share via PM to verified members.
Sent 5 vendor samples for HPLC — results inside
This is exactly the kind of community testing we need more of. Would you be willing to share the lab name so others can verify?
Used Janoshik Analytical for testing. They're well-known in the peptide community and provide detailed chromatograms with each report. Cost was $120 per sample.
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