I have been trying Acai berry supplement vitamins every day and am a very health conscious person. In my personal experience it has absolutely no effect on me whatsoever. I'm going to finish the bottle of which I'm about halfway through but I've seen absolutely no positive results in weight loss or anything. Like sportsguy said weight loss is 80% your diet and about 20% exercise. There is no miracle pill or leaf that will do the trick, it's just snake oil in my book.