Button Mushrooms Health Benefits, Due to their exposure to UV rays or sunlight, mushrooms are a natural, non animal source of vitamin D2 thats capable of increasing blood levels of this vitamin as Harnessing mushrooms for poultry nutrition: Boosting health, immunity, and productivity ScienceDirect The nutritional benefit of mushrooms is remarkable. For centuries, mushrooms have been legendary for their nutritional value. But it's only been recently that mushrooms have been studied and their true power revealed. Mushroom Biomass Waste Is a Source of the Antioxidants Ergothioneine and Glutathione