Tirzepatide Cost: Research Vendor Price Comparison

This page compares per-milligram pricing for research-grade tirzepatide sold by laboratory-supply vendors for laboratory use only. It is not the branded medication Mounjaro or Zepbound, not compounded tirzepatide from a pharmacy, and not a telehealth prescription — so the numbers here are raw-peptide costs per milligram, not a monthly treatment price, and they are not interchangeable with a prescribed medication.

The table below shows live per-mg pricing across the COA-verified vendors we track, sorted by the cheapest effective cost per mg after any verified discount. Because tirzepatide is sold in larger total-mg quantities than most peptides, big multi-vial kits push the per-mg price down to around $2.32/mg at the low end.

The biggest swing is total kit size. Tirzepatide is typically sold in bigger multi-vial quantities than other research peptides, so a small single vial can sit near the top of the range while a large multi-vial kit from the same tier of vendor falls to roughly $2.32/mg. Always compare on cost per mg, not sticker price.

The second factor is testing. A price that looks unusually low often reflects unverified purity. We only list vendors that publish independent, third-party COAs (Certificates of Analysis, typically from a lab such as Janoshik) — because underdosed or impure material is expensive at any price. Cheapest and best-value are not always the same row, and our ranking weighs verification, not just the number.