Figure 3.

A diagram illustrating the roles of various vitamins on different organ systems. All of these vitamins play important roles in the immune system, in addition to growth and development of various organs and, thus, physiological activities. Organ systems illustrated are the brain and nervous system, respiratory system, skeletal system, integumentary system, urinary system, reproductive system, immune system, digestive system, cardiovascular system, and ophthalmic system. Involvement of different vitamins to a particular organ is shown by a line pointing an arrow to the specific organ system.