Vitamins are nutrients that are taken in trace amounts from food but are necessary to maintain physiological functions. To date, more than 30 types of vitamins are known, and more than 20 are relevant to human health. They can be broadly divided into two categories: fat-soluble vitamins and water-soluble vitamins. The former includes vitamins A, D, E and K; the latter includes vitamin C and the B group. These vitamins are involved in nerve reflex regulation, energy transformation, substance metabolism, hormone synthesis and other important physiological functions, and they are mostly components of biological enzymes or coenzymes, which are essential components for catalyzing various biochemical reactions in the body. Deficiency or deficiency will cause a series of vitamin deficiency symptoms. 1, vitamin A: vitamin A deficiency can cause (1) reduced night vision (night blindness and corneal dryness, ulcers); (2) dry and keratinized skin and mucous membranes; (3) reduced resistance to disease and fight the carcinogenic effects of a variety of chemicals. Vitamin A is abundant in animal foods such as milk, meat, liver and eggs; plant foods such as green leafy vegetables and carrots (containing carotene) can also be converted into vitamin A in the human small intestine and liver, and there are now oral solutions rich in carotene as health food for the elderly. 2.Vitamin E: It has the effect of anti-oxidation and lipid peroxidation, and is classified as a drug to slow down aging. It can maintain human reproductive function, improve microcirculation, inhibit thrombosis, prevent atherosclerosis and many other effects. It is more abundant in legumes, especially in germ and vegetable oils. The general diet of normal elderly people rarely have a lack of phenomenon. 3, vitamin K: can promote blood clotting, strengthen intestinal motility and secretion function. In spinach, cabbage and tomatoes and other fresh vegetables and animal liver are rich in content. 4, B vitamins: including B1, B2, B6, B12, niacin, pantothenic acid, folic acid, choline, etc.. B group is widely present in meat, eggs, beans and cereals. A proper diet usually provides an adequate supply of these vitamins. Vitamin C is involved in the synthesis of intercellular collagen, reduces capillary fragility, prevents scurvy, and improves the body’s resistance and anti-cancer effects. Fresh vegetables and fruits are rich in it. As long as the diet is diversified, avoid vegetables cooked with strong fire, do not make improper cooking lead to vitamin C breakage. In the case of bleeding from the nose, throat and gums, oral or intramuscular injection of vitamin C can stop the bleeding.