There's a difference
Took this for about a month now...But was forced to stop while i was down with tonsillitises, till a week after recovery. The difference is very noticeable when I took a break from all supplements, to have a break between medication and supplements. I feel tired and difficult to crawl pass the day, restlessness, and focus is an issue too. Once I resume, these issues seem to be resolved.
Definitely, if one lacks of sleep, this isn't a supplement to feel hyper. It isn't a miracle pill. Discipline in sleeping time and all still counts.