I am only giving it 3 stars because I have only been on it for 2 weeks and combining it with Gingko Biloba which I heard is a great combination. I can say I definitely sleep better and it is helping with anxiety a lot, I fell more alert and willing to always be working on something I can not really explain but you just want to be productive and multitask ,as far as sexual drive / libido I have also noticed some increase and hopefully it gets better with time since the minimum of use is two to three months so after that timeline I will write another review.