A lack of research and other factors have led the American Academy of Pediatrics to discourage the use of supplements to improve performance in people under 18 years of age. The medical organization states that most of the supplements on the market offer few benefits, but they can pose great risks for adolescents. If you're worried that your teen isn't getting the vitamins he needs, talk to his pediatrician about dietary changes or a vitamin supplement plan. While most over-the-counter vitamin supplements are generally safe, they can cause toxicity if taken above the recommended daily dose.
Toxicity symptoms include nausea, skin rashes, and headaches. As with other supplements, long-term studies in adolescents have not been conducted. Most doctors agree that it's best for teens to get protein from their diet. Vitamin A promotes a healthy immune system, protects the eyes, keeps the skin healthy and is essential for cell growth and development.
Food sources include milk, eggs, fortified cereals, liver, peaches, dark green leafy vegetables, and mangoes.