Which GLP-1 is Best for Weight Loss?

The Weight Loss Rankings

Clinical trials show clear differences in how much weight people lose on different GLP-1 drugs:

That gap is real. Over 68 weeks, a 200-pound person on tirzepatide might lose 44 pounds on average, while the same person on semaglutide might lose 30 pounds.

Why Tirzepatide Works Better

The mechanism matters. Tirzepatide is a dual GLP-1/GIP agonist. That means it activates two different pathways in your body — both the GLP-1 receptor and the GIP receptor — which work together to suppress appetite and slow stomach emptying.

Semaglutide (Wegovy, Ozempic) is a GLP-1 only agonist. It works through one pathway, which is effective but not as potent for weight loss.

Liraglutide (Saxenda) is also GLP-1 only, but at a lower dose than semaglutide, so it produces less dramatic results.

But "Best" Is More Than Just Numbers

Weight loss percentage is important, but it's not the whole story. The "best" GLP-1 for you depends on:

• Insurance coverage. Your plan may cover Wegovy but not Zepbound, or vice versa. That often decides which drug you'll actually use.
• Side effect tolerance. Tirzepatide can cause more nausea initially. If you're sensitive to GI side effects, semaglutide might feel better.
• Your health history. People with a history of medullary thyroid cancer or personal/family history of MEN2 should avoid all GLP-1 drugs. Other conditions may make one drug safer than another.
• Availability. Tirzepatide supply has been tight. If your provider can't get it, semaglutide may be the practical choice.
• Cost out-of-pocket. Prices vary by insurance and whether you're using compounded versions.

What About Compounded Versions?

Compounded tirzepatide and semaglutide (made by specialty pharmacies rather than brand manufacturers) can be cheaper. But quality varies widely. The FDA doesn't regulate compounded drugs as strictly as FDA-approved brands, so you're taking a risk on consistency and purity.

If cost is your main concern, ask your doctor about patient assistance programs from Novo Nordisk (for Wegovy, Ozempic) and Eli Lilly (for Mounjaro, Zepbound) before turning to compounded versions.

The Bottom Line

If tirzepatide is accessible and covered by your insurance, the clinical evidence suggests it's the strongest choice for weight loss. But if semaglutide, liraglutide, or cost considerations make more sense for your situation, they're all legitimate options. Talk to your doctor about what works for your specific circumstances — not just the average weight loss numbers.