Aside from being rich in vitamin C, which is the number one vitamin that boosts immune function, spinach is also packed with antioxidants and beta carotene that are significant in the infection-fighting capabilities of our immune system.

It’s also high in iron and can boost stamina and mental function.

You can add a handful of spinach to your smoothie ingredients or lightly cook it with a dash of lemon juice and olive oil to serve as a side. Light cooking is important to retain its nutrients.