Vitamin E
Vitamin E is also a potent antioxidant like selenium. It can help fight any infection in the body since it enhances the immune system. A daily dose of 15 mg a day is what is recommended by the experts, and it is especially important as you age.

Vitamin C
Vitamin C is critical to the immune system. Not only does it support the production of antibodies, but it also supports the activity of natural killer cells (NK cells). NK cells are a type of white blood cell, which is essential to the immune system. Vitamin C consummation recommendation is 75–90 mg a day. You will want to pick ascorbate-based vitamin C supplements since our body best absorbs it.
Vitamin D
Vitamin D is typically provided by sunlight. Although, it can be difficult for most people to get enough vitamin D during winter.