Nope. Chaga is stimulant free, but it will give you an energy boost on the mitochondrial level for a more gradual boost of energy throughout the day, allowing you to perform at your best for much longer. Chaga also aids in improving sleep due to the fact that it does not stimulate the body in the way that caffeine does.  Chaga also works great with coffee (caffeine) if you choose to consume it as a mushroom coffee and extends the energy boost over a longer period of time without jitters or a crash. Smooth!