I must agree with the two very intellectual reps.
I myself have did not notice ANY benefits until day 10. The individuals who claim that they did not notice anything probably were doing 4 caps perhaps. I ran Drive at 6 caps and did not notice any immediate effects until day 10. You cannot base a product on the samples that the company provides. The sample is evaluate the energy levels of certian supplements like stims. Otherwise, you cannot judge something on a 2 day sample pack. I do not understand why people start saying things such as oh I didn't see anything when only buying a sample pack. Many other variables can influence the way an individual responds to these supplements such as diet,dosage and so on. If your going to take 4 caps per day until your bottle runs out while eating anything and everything you want, will you see any recomposition results? No.