Ordered a bottle ofby SouthLand Performance Products and started with my first dose Monday night. Dosed as per instructions and today, my normal cup of morning coffee hit me hard! It was almost like the first time I dosed two scoops of Jack3d! I was not expecting it to work this quick and to this level. I thought for sure it would at least take a full week to kick in. I didn't have any stims yesterday at all so I don't know if that has any bearing on it or not. All I can say is that if one cup of coffee hit me like that, what is the Jack3d gonna do!?! Sleep has also been somewhat better too. Me thinks it works! (So far) Will post again in a week to have more accurate results.