Vitamin A is also necessary for strong teeth. A deficient are more susceptible to infectious diseases, especially viral infections. Scientists have identified a group of compounds called carotenoids . Since vitamin A is fat soluble, it is stored in the body for a long time. A content is stored in the liver.
Problems usually occur when high doses of vitamin A therapy are used for skin conditions.
Smaller daily doses may produce toxicity in individuals with impaired liver function such as cirrhosis and hepatitis or in individuals who have a low protein intake. A child who accidentally ingests a large dose of vitamin A can become acutely toxic, however, symptoms generally subside upon withdrawal of the vitamin. You should always advise your physician of all over the counter medications you are taking. This includes all vitamins, minerals, supplements, and herbs. Vitamin C and E are important to the ultimate function of vitamin A. Adequate amounts of zinc, thyroid hormone and protein are also required for optimal vitamin A activity.