Vitamin A – characteristics, functions and phenomenon

Vitamin A characteristics functions and phenomenon

Vitamin A is also called retinol, beta-carotene, provitamin A and axophol. It belongs to the group of fat-soluble vitamins. It performs many functions in the body.

The recommended amount of this vitamin for adults is 1000 mcg per day and for children 400-700 mcg per day.

People who work behind a computer need more vitamin A.

Vitamin A plays an important role in the synthesis of steroid hormones, cell division and the proper condition of the epithelium. The retinal metabolite is an integral part of the visual red color. A characteristic symptom of vitamin A deficiency is night blindness, called night blindness (hemeralopia), caused by rhodopsin deficiency. Prolonged hypovitaminosis A can cause xerophthalmia (dehydration of the cornea and conjunctiva) and keratomolation (opacity and softening of the cornea) Excessive exfoliation of the epithelium can contribute to the formation of stones in the urinary tract and bile ducts, blockage of glandular ducts. (including lacrimal gland) Disturbances in the functioning of the entire epithelium (differentiation, growth) and hyperkeratosis of the epidermis are observed.

Vitamin A affects embryonic development and fertility. It stimulates the bone marrow to form red blood cells, accelerates wound healing, increases cellular and humoral immunity, acts as a thyroxine antagonist.

Symptoms of vitamin A deficiency include:

• dry skin,

• dry eye syndrome

• hyperkeratosis of the skin and epithelium

• brittle and fragile nails that grow slowly,

• brittle, brittle and dry hair

• rough skin

• lack of appetite

• increased susceptibility to infections,

• growth inhibition,

• Deterioration of vision, so-called “night blindness”.

Symptoms of vitamin A deficiency include:

• hyperactivity and irritability

• nausea, vomiting,

• headaches

• joint and muscle pain

• enlargement of the liver and dysfunction of the liver,

• yellowish skin lesions

• lower calcium content in the bones

• congenital defects in children of mothers who experienced hypervitaminosis during pregnancy.

The source of vitamin A is carrots, sweet potatoes, red peppers, dried apricots. It is also present in milk, cream, butter, chicken carcasses, chicken livers, egg yolks, green vegetables and mackerel.



Bojarowicz, H., & Płowiec, A. (2010). Effect of vitamin A on skin condition. Probl. High Epidemiol, 91(3), 352-356.