Vitamins are relatively versatile and play an important role in metabolic regulation in the body. Imagine vitamins as traffic police and signal lights in the body, meaning that macronutrients such as proteins, fats and carbohydrates enter the body, and many enzymes and coenzymes are played by vitamins in the process of metabolism. If vitamins are sufficient, metabolism will be more complete and function may be better, for example, vitamin D can play a good role in promoting calcium absorption, vitamin C can prevent bleeding and swelling of gums when brushing teeth and prevent the occurrence of scurvy, and vitamin A can make the function of dark vision relatively more powerful. So, vitamins play a major role in the body or metabolic regulation, different vitamin types and specific each vitamin, may play a more significant role in a certain metabolism.