There are four types of fat-soluble vitamins, namely vitamin A, D, E and K. The role of vitamin A can improve vision, especially the level of dark vision; the biggest role of vitamin D can promote the absorption of calcium; vitamin E, also known as tocopherol, has a very obvious role in improving the quality of sperm and eggs; vitamin K can be very good at synthesizing clotting factors, and its role and function in preventing bleeding disorders is very powerful. Very powerful. The water-soluble vitamins are mainly B and C. Vitamin B1, also known as thiamin, is very powerful in preventing foot disease. Vitamin B2 is called riboflavin and is very effective in preventing corns, tongue inflammation and dermatitis. Vitamin C is even more powerful, as it promotes iron absorption and collagen synthesis, and also prevents swollen gums and bleeding gums.