
Bone:
Vitamin D regulates the absorption and use of calcium and phosphorus. These minerals are vital for growth and the development and hardening of bones and teeth.
Immune System:
Parts of the bone marrow where immune cells are made respond to vitamin D, which is also thought to play a role in the prevention and treatment of infectious diseases.
Hormones:
By playing a role in the secretion of insulin by the pancreas, vitamin D helps in the regulation of blood sugar.
Nervous System:
Vitamin D ensures the functioning of healthy nerves and muscles by regulating calcium levels in the blood, vital for nerve impulse transmission and muscle contraction.