Alli (Orlistat)

Alli blocks about 25% of the fat you eat. Typically, enzymes in your intestines break down fat from food so your body can absorb the fat. But, the active ingredient in Alli attaches to some of these enzymes and prevents them from digesting about a quarter of the fat you eat. Because undigested fat can't be absorbed, it passes out of your body instead of turning into calories.

Alli is the only FDA approved, over-the-counter weight loss product, represented as an innovative weight loss program. With Alli, you can lose about 50% more weight than with just dieting alone.