The Health Benefits of White Button Mushrooms includes a rich source of Vitamin D, cancer prevention and much more. This is one of the rich varieties of mushrooms that you will find in the supermarket stalls near you. White button mushrooms are delicious and a rich source of minerals among a host of several other health benefits. Like Shiitake Mushrooms and Portobello Mushrooms white button mushrooms are an important agent for fighting cancer and boosting body immune system.