I'm now 2 weeks in , the first 10 days I used 30mg caps from a English company and wasn't feeling anything really. So ordered some more from a German company which are 20mg caps and BOOM! What a difference, better sleep, better workout after just 2 days , pumped up and generally feeling better. There is 2 reasons I ordered more, 1. I want to run it for at least 2 months and 2. To see if the ones I had already were legit, because I've been reading up and most people feel so thing within a week. The only downside for me is a bloated stomach which is strange because I'm not getting hungry like a lot of people talk about and my calorie intake hasn't changed.