Which vitamin is abundant in citrus fruits and helps boost the immune system?

Vitamin C is well-known for its role in boosting the immune system, making it prevalent in the context of citrus fruits. Citrus fruits, such as oranges, lemons, grapefruits, and limes, are particularly high in Vitamin C. This vitamin is crucial for the growth and repair of tissues in the body, as well as supporting the function of various immune cells. It helps protect against damage by free radicals and can enhance the ability of white blood cells to combat infections.

The other vitamins listed, while important in their own right, do not have the same direct association with immune system support that Vitamin C does. For example, Vitamin A is key for vision and skin health, Vitamin D plays a role in calcium absorption and bone health, and Vitamin E functions as an antioxidant but does not primarily focus on immunity like Vitamin C. Thus, the strong connection between Vitamin C and immune support, particularly from citrus sources, solidifies its recognition in this context.