For the maintenance of good eyesight and healthy skin, nails and hair. The most critical role of vitamin A is certainly in maintaining healthy eyesight. Another important role of vitamin A is its contribution to the growth of new body cells. This process is of crucial importance in maintaining healthy nails, tissue, skin and hair.
Beta-carotene is the orange pigment found in leafy greens and carrots and is a provitamin A carotenoid.
Beta-carotene is the most potent precursor of vitamin A, but its conversion is limited by a feedback system. If there is a vitamin A deficiency, beta-carotene is broken down into two vitamin A molecules by a specific intestinal enzyme, but if there is an excess of vitamin A, beta-carotene works as a tissue antioxidant, thus keeping the cells healthy. healthy. Although high doses of vitamin A in the retinol/retinyl ester forms have demonstrated toxicity in animals and humans, especially during pregnancy, beta-carotene is not associated with vitamin A toxicity.