Tirzepatide Price Comparison — Best Sources in 2026
Tirzepatide — the dual GIP/GLP-1 agonist sold by Eli Lilly as Mounjaro and Zepbound — is one of the most searched research peptides on the market, and price per mg varies dramatically by vial size and supplier. This guide ranks every vetted research source we track by live $/mg, factors in stackable coupon codes (often the closest analogue to a Zepbound coupon for research use), and pairs each offer with our independent testing transparency score.
Live tirzepatide prices by supplier
Sorted by best $/mg after applying default supplier coupons. Updated continuously.
| Supplier | Dosage | Price | $/mg | Testing | Coupon | |
|---|---|---|---|---|---|---|
| Loading live prices… | ||||||
See the full tirzepatide price page for out-of-stock listings, price history charts, and dosage-by-dosage breakdowns.
How to pick the best tirzepatide source
A $180 vial of 15mg tirzepatide is more expensive per mg than a $260 vial of 30mg. Always compare $/mg — our table does it automatically using the supplier's default coupon.
The strongest signal of a legit tirzepatide source is published HPLC purity, mass-spec identification, and endotoxin/sterility reports per batch. Suppliers publishing all four earn the highest testing scores.
Research suppliers don't issue Zepbound-style manufacturer coupons. Instead they run sitewide codes (typically 10–20%). We track them per supplier and apply them to the $/mg shown.
A great $/mg doesn't matter if the vial ships in a month or never arrives. This guide only ranks in-stock offers from suppliers with reliable shipping.
About tirzepatide
Tirzepatide is a dual GIP / GLP-1 receptor agonist developed by Eli Lilly and marketed as Mounjaro (type 2 diabetes) and Zepbound (chronic weight management). Research-grade tirzepatide sold by US suppliers is labeled for laboratory research purposes only and is not an FDA-approved product. PeptideMaxxing is an independent comparison site — we do not sell, prescribe, or recommend the use of tirzepatide.
How PeptideMaxxing ranks suppliers
We independently score every supplier across eight testing categories (purity, identification, endotoxins, sterility, heavy metals, conformity, net content, trust) and pull live pricing daily. Affiliate links don't change our ranking — the cheapest legit $/mg always wins.
Tirzepatide price FAQ
What is the cheapest source for tirzepatide?
The cheapest legit source depends on current stock and active coupons. Our live table ranks vetted suppliers by $/mg after coupon, so the cheapest legitimate option is always at the top.
How much does tirzepatide cost per mg?
Research-grade tirzepatide typically ranges from roughly $8 to $25 per mg, depending on vial size and supplier. Larger 30mg and 60mg vials usually offer the best $/mg.
Is research tirzepatide the same as Zepbound or Mounjaro?
The active peptide is the same molecule. Zepbound and Mounjaro are FDA-approved branded products from Eli Lilly; research tirzepatide is sold by US suppliers for laboratory research use only.
Are there Zepbound coupons for research tirzepatide?
No — manufacturer Zepbound savings cards apply only to the FDA-approved branded product. Research suppliers run their own sitewide coupons instead, which we track and apply automatically to displayed $/mg.