This is a good comment, dvokm5, and actually millions of people have taken alli since it launched on June 14, 2007. alli is the safest weight loss drug ever with an excellent safety profile and over 100 research studies. Keep in mind that the capsules work only in the gut to block 25% of the fat in the meal in which it's taken. It's doesn't enter the bloodstream or have action anywhere else in the body.
Hair loss can be caused by a number of factors including (but not limited to) thyroid problems, lack of fat in the diet, hormonal changes, etc.
It's important to have a well-rounded and healthy diet that promotes good skin, hair, etc. The alli diet is based on 30% total daily calories from fat, 20% protein and 50% carbohydrate -- the same as the American Heart Association, the Dietary Guidelines for Americans and other healthcare organizations.
I hope this helps.
Pat