What are the functions of different kinds of vitamins?

Vitamins are essential substances to maintain human health. Although the required amount is small, it must be supplemented from food because it cannot be synthesized in vivo. Vitamins are very important for maintaining the normal growth and development of human body and regulating various physiological functions. Vitamin A, the most easily deficient vitamin in human body: preventing cancer; Maintain normal vision and prevent night blindness; Maintain normal function of mucosa and enhance resistance; Maintain the normal development of bones and teeth; Make skin smooth and tender. Vitamin B 1: strengthen the function of nervous system; Maintain the normal activities of the heart and brain; Can enhance children's learning ability; Prevention of malnutrition beriberi. Vitamin B2: Maintain the health of oral cavity and digestive tract mucosa; Can correct and maintain eye vision and prevent cataracts; Prevent rough skin. Vitamin B3: Keep skin healthy; Reduce blood pressure and maintain blood circulation; Conducive to the normal operation of the nervous system. Calcium pantothenate: participate in the production of antibodies and enhance immunity; Helps convert carbohydrates, fats and protein into energy. Vitamin B6: keep the body and mental system in a healthy state; Maintain the balance of sodium and potassium in the body and regulate body fluids; Anti-dermatitis and alopecia prevention; Participate in the production of red blood cells; Maintain the normal function of insulin. Folic acid: participate in the production of red blood cells and white blood cells to prevent anemia; Prevent stunting, graying and premature graying. Vitamin B 12: Participate in the formation of bone marrow red blood cells and prevent pernicious anemia; Prevent brain nerve damage. Vitamin c: fight against free radicals and help prevent cancer; Lower cholesterol; Improve the immunity of the body; Conducive to wound healing; Promote the absorption of calcium and iron; Prevent scurvy. Vitamin D: Promote the absorption of calcium and phosphorus, help children develop teeth and bones, supplement the calcium needed by adult bones, and prevent and treat osteoporosis, rickets and osteomalacia; Prevent myopia. Vitamin e: anti-free radical, beauty, delaying the aging process; Helps prevent cancer and cardiovascular diseases; Helps lower blood pressure; Prevention of anemia in infants; Reduce abnormal phenomena in menstruation. Vitamin k: coagulation; Conducive to the repair and growth of bone cells.