Vitamin D also plays a vital role in the immune system, helping to prevent infections and reducing the risk of chronic diseases such as multiple sclerosis, rheumatoid arthritis, and some types of cancer. Without adequate vitamin D, the body can't absorb calcium efficiently, which can lead to weak bones and an increased risk of fractures. It promotes the absorption of calcium from the diet into the bloodstream, which in turn, helps in the mineralization of bones and maintaining bone density. One of the primary functions of vitamin D is to regulate the levels of calcium and phosphorus in the body, which are important for the development and maintenance of strong bones and teeth.

Vitamin D plays a crucial role in maintaining good health and is essential for proper functioning of the body. Marks, R.) 66–73 (Blackwell Scientific, Oxford, 1994).Vitamin D is a fat-soluble vitamin that is naturally present in some foods and can also be obtained through sun exposure and supplements. in Retinoids in Cutaneous Malignancy (ed.

Pathophysiology of premature skin aging induced by ultraviolet light. Retinoic acid inhibits induction of c-Jun protein by ultraviolet radiation that occurs subsequent to activation of mitogen-activated protein kinase pathways in human skin in vivo. Molecular basis of sun-induced premature skin ageing and retinoid antagonism.

Treatment of photodamage with topical tretinoin: An overview. Vitamin D: New horizons for the 21st century. in Le Temps Chanel (Le Chene/Grasset, Paris, 1980 ). in Phototherapy (Edward Arnold Publishing, London, 1901 ). Ultra irradiation of human skin causes functional vitamin A deficiency, preventable by all- trans retinoic acid pre-treatment.

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