I always go to sleep before the evening's (about 22:00) one capsule. Approximately 20 - 30 min. later I fall asleep super. Very rare (1-2 times a month) I wake up at night once more and then take another one capsule, then I sleep well until 6:00. I then rested and really start to 8:00 again with the sport (he split 5). I suppose now since more than 1 year continuous daily inputs notice any negative side effects or any problems. One hand by the capsules resulting muscle growth so I can not confirm now. For me, more of a super sleep / recovery help! Very strong buy recommendation;)