The Best GLP-1 for Weight Loss in 2026

By average trial results, the best GLP-1 for weight loss is tirzepatide (Zepbound) — about 21% average body-weight loss in SURMOUNT-1, the most of any FDA-approved weight-loss drug. Semaglutide (Wegovy) is next at ~15–17%. “Best” still depends on your health, insurance, tolerance to side effects, and whether you want an injection or a pill — the right choice is individual and made with a prescriber.

On average, Zepbound (tirzepatide) produces more weight loss than Wegovy (semaglutide) — roughly 21% vs 15–17% in their pivotal trials — likely because tirzepatide is a dual GLP-1/GIP agonist. Both are highly effective; the better pick for you depends on side-effect tolerance, cost, and insurance coverage. See our semaglutide vs tirzepatide breakdown.

Among FDA-approved drugs, Zepbound (tirzepatide) is the strongest at ~21%. The investigational injection retatrutide produced even more in trials (~28%) but is not approved or available yet, so it can’t be prescribed.

The oral semaglutide “Wegovy pill” produced the most weight loss among pills (~16.6% on-treatment), while Foundayo (orforglipron) is the most convenient (no food, water, or timing rules) at ~12%. Both are FDA-approved as of 2026. Rybelsus is an older oral semaglutide approved for diabetes, not weight loss.

The lowest cash prices are usually compounded semaglutide or tirzepatide via telehealth (from about $69/month), but compounded drugs are not FDA-reviewed. Among brand options, manufacturer cash programs (Zepbound vials from ~$349/mo, oral Wegovy ~$149/mo) are cheapest. See our cheapest-GLP-1 guide for the full ranking.