Stroll the aisles of any pharmacy or “health food” store and you’ll see a multitude of herbs and other supplements that claim to boost energy. Yet there is little or no scientific evidence to support such claims for most of these substances. The fact is, the only thing that’ll reliably boost your energy is caffeine or other stimulant—and their effects wear off within hours. Substances commonly touted as energy boosters include chromium picolinate, coenzyme Q10, creatine, dehydroepiandrosterone (DHEA), ephedra, ginkgo biloba, ginseng, guarana, and vitamin B12. Instead of relying on a supplement for energy, try switching to a healthful diet—more vegetables, fruits, whole grains, nuts, lean protein, and unsaturated fats—and exercising more. That’s truly a better way to beat an energy shortage, and it’s one your whole body will appreciate.