Animal liver is rich in vitamins as follows: 1, vitamin A is an important raw material for the retina, so the role of improving vision levels and relieving visual fatigue will be very obvious. The two of them are: 1. Vitamin A is an important raw material for the retina, so it can improve the vision level and relieve the fatigue of the eyes. 2. Through the joint action of these two, eating animal liver supplement vitamin D in the prevention of osteoporosis, prevent waist and knee weakness, back and leg pain and other roles will also be very obvious.