This document discusses vitamins and their functions, sources, deficiency and excess symptoms. It covers vitamins A, B, C, D, E, K. The key points are: - Vitamins perform important roles in the body like cell growth, digestion and immune function. - Sources include fruits, vegetables, dairy, eggs and fortified foods. - Deficiency can cause issues like blindness, skin problems or weak bones while excess can also lead to side effects like nausea or liver damage. - Vitamins have daily requirements and the body can store some but not others.