Vitamin D, a group of lipophilic steroid derivatives that are hormonal precursors, is a fat-soluble vitamin responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, among other biological effects. In humans, the most important compounds of vitamin D are vitamin D2 (ergocalciferol) and vitamin D3 (also known as cholecalciferol).

Physiological role
Vitamin D plays an important role in calcium homeostasis and metabolism. It can be used to prevent rickets and "adult osteomalacia". When used in combination with calcium, it can prevent osteoporosis in the elderly. In addition, IT plays a role in neuromuscular function and inflammation, affects the expression and translation of many genes, and regulates cell proliferation, transformation and apoptosis.
Access to source
Vitamin D is not found in many foods, but you can get it from fortified milk, fortified cereals, and fatty fish such as salmon, mackerel, and sardines.
What are the symptoms of vitamin D deficiency
Vitamin D has several roles in the body, including:
Keep bones and teeth strong;
Promote muscle function;
Helps the brain and body function;
Resistance to infection.
Symptoms of vitamin D deficiency include:
Fatigue;
Muscle weakness and/or pain;
Pain in the joints;
Depression.
Safety and side effects
It is generally considered safe to take appropriate doses of vitamin D.
But too much vitamin D can be harmful. Children 9 years of age and older, adults, and pregnant and lactating women who consume more than 4,000 IU of vitamin D daily may develop:
nausea
vomiting
Loss of appetite
constipation
weak
Weight loss
confusion
disorientation
Rhythm of the heart problem
Kidney injury

