The benefits of vitamin A include maintaining healthy skin and mucous membranes, contributing to the maintenance of normal vision, and contributing to the maintenance of immune function. The downside is that it may cause toxicity if taken in excessive supplementation of vitamin A preparations. Vitamin A is a nutrient that has the ability to maintain the elasticity of the skin and mucous membranes, maintain skin luster, and maintain normal vision. In addition, vitamin A plays an important role in maintaining the body’s immune system. Generally, people can consume a certain amount of vitamin A through foods such as animal liver, eggs, spinach, greens, capers, broccoli, etc. Some people with severe deficiencies may need to take supplemental vitamin A preparations. Generally there is no harm in supplementing vitamin A in moderation, but if it is in excess, it may cause symptoms of toxicity, resulting in drowsiness or over-excitement, headache, vomiting, dry, flaky, cracked skin, and other symptoms. It is recommended to consume foods containing vitamin A in moderation, and if you want to use medication be sure to take it under medical supervision.