alli is an FDA approved weight loss supplement that helps block about 25 percent of the fat you eat from being absorbed Acts as an effective weight loss product and diet pill for both women and men For every 5 pounds you lose through diet and exercise, alli can help you lose 2 to 3 more alli weight loss supplement works in the digestive tract and is minimally absorbed into the bloodstream, so there are no direct effects on the cardiovascular or central nervous system alli capsules are a weight loss pill for overweight adults, 18 years and older, when used along with a reduced calorie and low fat diet