DMAE takes son during a time of great mental stress. This thing is good help. Previously purchased karsuly by Now Foods, there is quite a high dosage and recommendation - to 3 capsules per day. We bought these and puzzled. All the same capsule 100, but the content of active substance is less than - 100 mg, than from the capsules Now Foods. It is recommended to take 1 capsule per day. I had here, Izumi, refer to the references and find acceptance rate. To quote: "is 200-500 mg per day In mental and physical fatigue and to improve the state of health can take 500-1000 mg or more per day DMAE course of three months for life extension and aging prophylaxis recommended dose...." In general, while taking the same 3 capsules a day, we plan to move to a higher concentration. The effect is the same as that of the first embodiment. Reviews of other means-tested - on my page.