Middle-aged and elderly people take vitamins every day to protect eyesight, maintain substance metabolism, antioxidant, promote calcium absorption and other benefits. 1, vision protection: Vitamin A, also known as retinol or anti-dry eye factor, can maintain normal visual function. 2, maintain material metabolism: B vitamins are water-soluble vitamins, mainly involved in the body's material and energy metabolism. 3, antioxidant: Vitamin C has a strong free radical scavenging effect, contribute to the body's antioxidant, anti-aging. 4, promote calcium absorption: vitamin D can promote the absorption of calcium in the small intestine mucosa, conducive to bone development. Vitamin is essential to maintain human life activities, although the content of the body is small, but it is indispensable, if vitamin deficiency, need to take medicine under the guidance of a doctor.