I started using Alphamine last week as a preworkout and morning booster. I stacked it with nutrex n-vein. This is a great thermo! It kicked in very fast! I started to feel my body temp raise on the drive to the gym. When I did start my workout, I was basting like a thanksgiving turkey! I have found this to be very addicting and the energy is very clean with no crashing. Definitely recommend giving it a try. The margarita flavor is great.