Best Tirzepatide Suppliers in 2026: 20 Vendors, Real Prices

Eli Lilly will sell you a month of Zepbound at its top dose for $449 through its own self-pay vial program. Four weekly 15 mg doses, 60 mg of tirzepatide, works out to roughly $7.48 a milligram from the company that invented the molecule. We priced the same milligram across the 20 research vendors on our board, and 13 of the 18 with stock right now come in under that number. The cheapest sits at $1.66. That gap is the reason "where do I buy tirzepatide" is such a mess of an answer, and it is why we built a scored list instead of a link dump. Below is who currently sits at the top of it.

The $7.48 benchmark, and what it actually buys

Lilly cut its LillyDirect self-pay prices on December 1, 2025: $299 for the 2.5 mg starter vial, $399 for 5 mg, and $449 a month for everything from 7.5 mg up to 15 mg. Run the milligram math across that range and the price per milligram drops as the dose climbs, from about $120/mg at the starter dose down to $7.48/mg at 15 mg.

That $449 buys an FDA-approved drug made under pharmaceutical manufacturing controls, dispensed through a prescriber. The research-grade market our board covers sells material for laboratory work, with no FDA approval behind it. These are two different products with two different sets of guarantees, and the price comparison is useful precisely because it gives you a fixed reference point that most vendor sites will never show you.

Inside the research market, the spread is wider than most people expect. The cheapest in-stock milligram we track is $1.66. The most expensive is $22.50. Median across all 18 in-stock sellers: $4.83. Narrow it to the 15 that ship inside the US and the median rises to $5.15. Same molecule, 13.6x between the ends of the board.

Vial size explains most of the spread

Here is the part that gets missed. The spread is largely a packaging story, and you can watch it happen inside a single vendor's catalog.

NuLife Peptides lists tirzepatide in three sizes: 15 mg for $75, 30 mg for $95, and 60 mg for $115. That is four times the material for forty dollars more, and it moves the price from $5.00/mg to $1.92/mg without changing vendors, lab, or shipping. Polaris Peptides runs a five-rung ladder from 5 mg at $11.00/mg down to 60 mg at $5.15/mg. Peptide Technologies sells a 120 mg vial for $329.95, the largest single tirzepatide listing anywhere in our data, at $2.75/mg.

So a $22/mg listing is almost always a 5 mg or 10 mg vial doing what small vials do everywhere. Our advice: compare per milligram at the size you would realistically buy, and treat a headline "cheapest tirzepatide" number as a bulk price until you check the vial it came from. The GLP-1 price index does this normalization for you across semaglutide, tirzepatide, and retatrutide.

The five sellers we would point at

Six of the 20 tirzepatide vendors on our board carry a Finnrick blind-buy lab result, where the lab purchases the product anonymously instead of testing a sample the vendor hand-picked. Five of those six are the five below, which follows directly from our rubric: third-party COA quality carries the heaviest weight in how we score vendors.

PR Score 9.0 out of 10, ranked 2nd of the 72 vendors we track. Finnrick grade A on a blind buy, based in Flower Mound, Texas, ships US, and takes a plain credit card. Tirzepatide runs $49.99 for a 10 mg vial ($5.00/mg). It sells one size only, so the bulk discounts elsewhere on this list stay out of reach, and at fifty dollars it is still the cheapest way to place a first order with the highest-scored seller here. Full scorecard.

PR Score 8.3, ranked 5th of 72, Finnrick-verified, US shipping, and the only vendor we would recommend that gets under $2.00 a milligram. The 60 mg vial at $115 is $1.92/mg, the cheapest US-shipping tirzepatide on our board and roughly a quarter of Lilly's per-milligram rate. It also takes ACH, Apple Pay, credit card, and Zelle, which is unusually flexible for this market.

PR Score 8.1, ranked 6th of 72, Finnrick, out of Sheridan, Wyoming. The 120 mg vial at $329.95 works out to $2.75/mg, and the 50 mg at $169.95 is $3.40/mg. If you want the largest single unit available with real third-party testing behind it, this is it.

PR Score 7.8, ranked 15th of 72, Finnrick, US-based, credit card and Venmo. Five in-stock sizes from 5 mg to 60 mg is the widest ladder of anyone selling tirzepatide here, which makes it the easy pick if you want to start small and scale up inside one vendor's COA history.

PR Score 8.0, ranked 10th of 72, Finnrick, US shipping, 25 peptides listed on its Aavant Research scorecard. Tirzepatide is $65 for 10 mg ($6.50/mg), so you pay a premium per milligram, and what you get for it is the broadest catalog among our top-scored sellers. Payment is crypto and Zelle only, which is the one thing keeping its score out of the high 8s.

Every score above is live on the vendor's page with its six sub-scores broken out, and the full ranked list for this compound sits on the tirzepatide page. If you want to see the same treatment applied to the newer triple agonist, we ran it on retatrutide suppliers too.

What a great tirzepatide COA shows

Most "how to vet a vendor" checklists are compound-agnostic. Tirzepatide deserves a specific one, because of how it is built.

Per the FDA label, tirzepatide is a 39 amino acid peptide with a molecular weight of 4813.53 Da and the formula C225H348N48O68. The interesting part is position 20: a lysine residue carrying a C20 fatty diacid on a linker. That side chain binds albumin and stretches the half-life to about five days, which is what makes weekly dosing possible at all. It is also the hardest part of the molecule to attach correctly.

So on a tirzepatide COA, look for:

Our longer walkthrough on reading a peptide COA covers the rest of the document line by line.

Where tirzepatide stands right now

Tirzepatide is FDA-approved as Mounjaro for type 2 diabetes and as Zepbound for weight management, and the clinical file behind it is strong. In SURMOUNT-1, 2,539 adults with obesity or overweight took weekly tirzepatide or placebo for 72 weeks. Mean weight change was -15.0% at 5 mg, -19.5% at 10 mg, and -20.9% at 15 mg, against -3.1% on placebo (Jastreboff et al., New England Journal of Medicine, 2022).

The compounding picture closed in 2025. FDA declared the tirzepatide shortage resolved on December 19, 2024, ending the window that had let compounders make their own versions: enforcement discretion for 503A pharmacies lapsed in early 2025, and for 503B outsourcing facilities on March 19, 2025. Everything the vendors above sell is labeled for research use only and is not approved for human use. Talk to a doctor about the approved product if a GLP-1 is something you are considering.

We refresh vendor pricing weekly, so the numbers here move. The full vendor board always carries the current ones.

Sources

FDA, Mounjaro (tirzepatide) prescribing information: https://www.accessdata.fda.gov/drugsatfda_docs/label/2022/215866s000lbl.pdf

Jastreboff AM et al., "Tirzepatide Once Weekly for the Treatment of Obesity," New England Journal of Medicine, 2022 (PMID 35658024): https://pubmed.ncbi.nlm.nih.gov/35658024/

Eli Lilly, "Lilly lowers the price of Zepbound single-dose vials," December 1, 2025: https://investor.lilly.com/news-releases/news-release-details/lilly-lowers-price-zepboundr-tirzepatide-single-dose-vials

FDA, Declaratory Order: Resolution of Shortages of Tirzepatide Injection Products: https://www.fda.gov/media/184606/download

FDA, "FDA clarifies policies for compounders as national GLP-1 supply begins to stabilize": https://www.fda.gov/drugs/drug-alerts-and-statements/fda-clarifies-policies-compounders-national-glp-1-supply-begins-stabilize

PeptidesRated GLP-1 price index, updated weekly: https://peptidesrated.com/glp-1-prices