I I received my samples last Thursday, so Friday I tried on Friday morning. At first did not fell anything but then it hit me and it was mild and pleasant. I had that feeling about 3 hr but that was on one pill. I tried it again on Monday and it was pretty good. I think I feel it more when taken with my lunch. I applied to be a tester so HOPE I GET IT ... if not I will still like to give Leviathan a run. :head: