A powerful stimulant refers to something that greatly increases activity or alertness in the body and mind. It can make you feel more energized, focused, or awake. Full definition
Coffee is known to raise the heart rate, improve the fat burning process and is one of the most powerful stimulants of the nervous system. (fitnessandpower.com)
Of the two, glutamine is the more powerful stimulant for cancer cell growth.» (drjockers.com)
It is no doubt the most powerful stimulant known; being powerful only in raising and maintaining that heat on which life depends.» (fieryfoodscentral.com)