Sorry, wrong punctuation. The Food and Drug Administration allows for at least three types of claims about food products and dietary supplements. Energy doesn't usually fall into this category. In other words, buyer beware. Each claim must follow FDA requirements, such as, for calcium, also stating the need for regular exercise and diet, and for products with more than 400 milligrams of calcium, that a daily intake over 2,000 milligrams offers no added known benefit to bone health.
Food provides energy.
The energy that food provides is measured in a scientific unit called a calorie. Caffeine, guarana, ginseng and ephedra are common ones. Though they may have additional properties, they're also stimulants - legal ones, but stimulants nonetheless. Still, claims of increasing energy with supplements might also be characterized as truthful. Whether they're misleading is another question.