A search for what retatrutide costs has an answer, and it is not a dollar figure. There is no approved retatrutide product in the United States, no compounded route a pharmacy may lawfully use, and therefore no lawful price to compare. What exists instead is a late-stage trial program, a gray market that quotes numbers anyway, and a set of federal statements about both. Those are worth reading before paying anyone.
What FDA says, in its own words
On its page about unapproved GLP-1 drugs used for weight loss, FDA gives retatrutide its own heading and one sentence: retatrutide and cagrilintide cannot be used in compounding under federal law[1].
The sentence after it explains why that follows. They are not components of FDA-approved drugs, and they have not been found safe and effective for any condition[1].
That first clause is the legal hinge. The compounding exemption for a bulk substance runs through being a component of an approved drug, or appearing on a list FDA maintains, and retatrutide is neither.
The 503A bulk substances list, updated May 14, 2026, does not name it in any of its three categories[2]. The 503B list for outsourcing facilities, updated March 21, 2025, does not name it either[3].
Neither list has an entry under the molecule’s name or under its development code. How the two lists differ is set out in 503A vs 503B.
Who FDA has warned about it
The same page names three groups the agency has already written to over this molecule, which is a better description of the market than any price would be.
It has warned telehealth companies for marketing unapproved drugs such as retatrutide, including direct marketing to consumers[1].
It has warned active pharmaceutical ingredient distributors for selling retatrutide and other GLP-1 drugs to compounders, and outsourcing facilities for repackaging retatrutide[1].
Separately, it has warned companies that illegally sold unapproved drugs containing semaglutide, tirzepatide, retatrutide, survodutide or mazdutide labeled “for research purposes” or “not for human consumption”, while supplying them to consumers with dosing instructions[1]. That labeling convention is explained in RUO peptides.
What the trials have measured
The evidence is real, which is part of why the demand is. A phase 2, double-blind, randomized, placebo-controlled trial enrolled 338 adults with a body-mass index of 30 or higher, or 27 to under 30 with a weight-related condition[4].
Participants received subcutaneous retatrutide at 1, 4, 8 or 12 mg, or placebo, once weekly for 48 weeks[4].
| Group | Change in body weight |
|---|---|
| Retatrutide 1 mg | −8.7% |
| Retatrutide 4 mg (combined) | −17.1% |
| Retatrutide 8 mg (combined) | −22.8% |
| Retatrutide 12 mg | −24.2% |
| Placebo | −2.1% |
The trial was funded by the manufacturer, and several authors were its employees[4]. The most common adverse events were gastrointestinal, dose-related and mostly mild to moderate, and dose-dependent increases in heart rate peaked at 24 weeks before declining[4].
Phase 3 has followed. The master protocol registered as TRIUMPH-1, a randomized, double-blind, placebo-controlled trial in participants without type 2 diabetes who have obesity or overweight, enrolled 2,335 people and reached primary completion on April 6, 2026[5].
A completed phase 3 trial is not an approval, and an approval is not a price. Both still have to happen before anyone can quote a retatrutide month the way Zepbound price quotes one.
What can be priced today
The molecules with an approved product or a lawful compounded route are the ones with a real figure attached, and the whole point of a comparison is that the figures are comparable.
Compounded semaglutide and tirzepatide both have published markets, computed from every seller that publishes a monthly price, and each brand has a maker's own self-pay price to set against it.
Those sit in compounded semaglutide cost, compounded tirzepatide cost and tirzepatide vs semaglutide cost.
The compounding rules that decide which of them a pharmacy may make, and what changed when the shortages ended, are in is compounded tirzepatide legal.