Finally, something works for me as advertised. I'm sure as with anything it depends on the person. I initially bought to add to my gym performance. I knew to wait about a week to see any difference. After the 3rd day there was a noticeable improvement in all areas. I purchased again and if this continues I'll sign up for the auto delivery. So far I'm happy with results, well worth the 20 bucks I spent. This review is based solely on MY experience with it. Looking at the reviews not everyone will have the same results.