The demand for vitamins is varied, and different vitamins have different physiological functions. A variety of vitamins should be supplemented at the same time, which can better enhance the body's resistance. High immunity can eat vitamin A, which plays an important role in the immune system. If the human body lacks vitamin A, it will cause diseases such as digestive system and reproductive system. You can eat vitamin e, which can improve your anti-infection ability. Especially the elderly and infirm, pregnant women with chronic diseases for a long time, etc. You can consider taking vitamin C complex to improve your physical fitness and enhance your resistance. You can eat vitamin c, which has antioxidant effect. And protein, iron, zinc. Improve immunity. Take multivitamins and eat foods rich in vitamins. I hope I can help you!