Vitamin A

Vitamin A

Vitamin A

Vitamin A is a group of fat-soluble vitamins. Retinol is an animal form of Vitamin A and found in foods like meat, liver, milk, or cheese, and others. The other principal form of Vitamin A are dietary carotenes, especially the most frequent beta-carotene. They are found in carrots, pumkins, sweet potatos, or spinach.

Functions

Vitamin A is essential for protein metabolism, fertility, healthy mucous membranes, good vision, and the overall immune function. As stress raises the protein demand, Vitamin A demand rises accordingly. Hence Vitamin A demand is also raised through serious deseases like cancer. Besides stress also operations, inflammations, as well as smoking increase the Vitamin A demand.  

Deficiency

A lack of Vitamin A may result in bad vision, especially night vision, higher danger of infections, raised risk of arteriosclerosis, general exhaustion, lower fertility, dry, itching skin, or thin hair. Intense sunlight (at sea, at the beach) increases the degradation of retinol and beta-carotene in the eye, causing Vitamin A deficiency.

Recommended Daily Intake

The recommended daily intake for adults is 900 µg/day for men, and 700 µg/day for women. 

Contraindications

During or before a pregnancy Vitamin A supplements should not be taken without consultation of a doctor.

 

 

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