Can vitamin C boost the human immune system?

Vitamin C is one of the most important antioxidants in the human body. Antioxidants help reduce damage caused by free radicals to both cellular and non-cellular tissues, meaning that vitamin C can enhance the function of the immune system. Research has shown that high intake of vitamin C can suppress viral infections, increase the sensitivity of immune responses, promote overall immune function, and reduce the severity of illness during infections. As an antioxidant, vitamin C promotes the production of white blood cells, which are fundamental components of the human immune system. It also increases the number of lymphocytes, thereby strengthening the immune system's capacity and improving resistance against bacteria, viruses, and other foreign substances. In addition, vitamin C supports normal functioning of the intracellular immune system, activates cytokines, and enhances the activity of antioxidant enzymes in the body. Therefore, vitamin C can boost the body's immunity. Appropriate supplementation of vitamin C is thus an important measure for enhancing immune function and helping individuals better resist diseases.