Vitamin A Description

Description

A fat-soluble vitamin, stored mainly in the liver. Vital for maintenance of good eyesight, particularly for the normal function of the retina and visual adaptation to darkness, and healthy skin. It is also important for growth in children.

Food Source

The richest natural sources are fish liver oils. It is also very concentrated in animal liver. Other sources include oily fish, egg yolk, fortified margarine, butter and full fat milk.

Intake

EU Labelling RDA: 800mcg

Deficiency Symptoms

Increased susceptibility to infections, scaly skin, flaking scalp, brittle, dull hair; poor eyesight and night vision, loss of appetite.

Who might Benefit from supplements

Those on a low fat diet or with fat malabsorption problems.

Side Effects/Precautions

Just before, or during the first three months of pregnancy, women are advised by the Department of Health that they should not eat liver, or take vitamin A supplements which contain more than the 800mcg RDA unless under medical supervision. As vitamin A (retinol) is teratogenic, it may induce developmental abnormalities in a foetus if taken in high amounts just before, or during the first three months of pregnancy. However, too little vitamin A in pregnancy can also cause problems. Some prescription medicines may reduce the absorption of vitamin A. Upper safe level: 2300mcg (long term usage); 7500mcg (short term usage)