Alli markets itself as the only FDA approved over the counter diet pill, and this is because they actually use a smaller amount of a prescription weight loss medication. The biggest problem with Alli is the fact that it doesn’t actually work. They have conducted studies only using the prescription amount used in Xenical of Orlistat, not Alli. In those studies, participants lost 5-10% of their weight in the course of a year, when combined with a no fat diet. The weight lost was not necessarily fat. After they stopped taking the product, most subjects gained the weight back. To give you an idea of how much or how little that is, if you weight 160 pounds, you would have expected to lose 8-16 pounds in a year, and some did not actually experience that weight loss. If you diet and exercise, even with a diet less harsh than theirs, you should expect to lose 2 pounds per week or 8 pounds in a month, 16 pounds in two months. The question would be why are the results so slow? Moreover, users generally experienced side effects when consuming any even small amount of fat and sometimes even when they did not, the worst of which was defecating in their pants, resulting in the need for adult diapers or extra pairs of pants, and they also suggest dark pants in general terms. In short, you could definitely find a better product than Alli that actually works.