An energy-promoting composition includes a stimulant component such as caffeine, a vasodilator component, an energy source including an exogenous ketone body component, and optionally a nootropic component. The separate components beneficially and synergistically interact with one another enhances the overall energy-promoting effect of the composition more rapidly and to a greater degree than if one or more of the components are omitted. The energy-promoting composition is also formulated to minimize the crash effect common to stimulants such as energy drinks.