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It is generally found in the form of PROVITAMIN A or CAROTENE, in most plants and green vegetables and many fruits: Carrots, Red pepper, paprika, garlic, onions, tomatoes, lettuce, potatoes, spinach leaves, peach, mulberry, horse chestnut, bananas, turnips, nectarine, pineapple, watermelon, cereals, currants, raspberries, blackberries , papaya, apricots, lemons, oranges, rose hips or rose hips, oleaginous fruits and vegetable oils. Also abundant in wheat germ.. THE 4 MAIN SOURCES OF PROVITAMIN A (CAROTENOIDS) BETA-CAROTENE: It has as main functions; maintenance of the skin, promotes the development of tissues and in particular epithelial tissues (cornea of ​​the eye, intestine, respiratory tract). Maintenance of the mucous membrane, the metabolism of hormones and lipids (polysaccharides). Moreover, it plays a role in growth, it is particularly necessary in the growth of children. In addition provitamin A or beta carotene is one of the best antioxidants. HEMERALOPIA (VISUAL DIFFICULTIES AT DUSK) or night blindness, then alteration of the retina and degeneration of the optic nerve. XEROPHTHALMIA: alteration of the epithelial tissues: thickening and opacification of the cornea and stopping of lacrimal secretions. Depletion of the epithelial cells of the intestine which no longer secretes mucus, destruction of the intestinal villi. Keratinization of the mucous membranes of the nose of the th*oat and bronchi. Expose to the formation of kidney stones. Stopping growth and decreasing bone strength. Weight loss due to malnutrition, tiredness, decreased resistance to infections (flu, etc..). Disorders of the rules: painful hardening of the br*asts, abdominal pains, migraines, nervousness, anxiety. Reproductive disorders (infertility, abnormal embryonic growth, spontaneous abortion). HYPERVITAMINOSES or excess vitamins are only for fat-soluble vitamins that tend to accu*ulate in fat. Severe poisoning from ten times the thera*eutic dose. The main contraindication of vitamin A in high doses is during pregnancy. May