I have been taking Brainzyme Professional for now roughly 4 months (5 days on 2 off). There is a noticeable difference. I used to drink espressos 2-3 times through out the first half of the day to keep myself going. I now take 2 capsules as soon as I wake up and do not drink coffee at all. It works even better no ups and downs coffee feeling or coffee shakes. If the morning has been a busy one and I need to get stuff done in the afternoon I may take one more capsule but that rarely happens. You do feel more absorb in what you are doing and have that sense of flow some people talk about when working. Will keep on buying it. This should be in vending machines (much more useful and natural than a sugar boost), everybody needs it.