Vitamins do not have any calorie content. Only fat, protein and carbohydrates provide calories. Vitamins are chemicals the body needs in small amounts to support important biochemical reactions.
Some commercial preparations of vitamins may have added sugar to make them more palatable. This added sugar does provide calories. For example, a children's chewable multivitamin made by Planet Rx provides four calories per vitamin.
Some vitamins, particularly the B vitamins, are advertised as energy providers. Although these vitamins do not provide energy directly in the form of calories, the vitamin content may make individuals feel more energetic. Vitamins are involved in breaking down food so that the calories in the food can be utilized by the body. If the diet is lacking in certain vitamins, symptoms of fatigue may result.