Supplements can aid in meeting the higher nutritional needs of your more stressful lifestyle or medical illness. Stresses, medical complications and an active lifestyle may all create a greater need for your body's particular minerals or vitamins. Dietary supplements can come in many forms, including capsules, tablets and powders, along with drinks and energy bars. Many believe that dietary supplements will boost energy performance, strength as well as prevent deficiencies in nutrition and boost their overall health.