The complex role of phytochemicals in the body A diet full of natural foods is our best defense against pathogens as they contain polyphenols or plant chemicals aka: phytochemicals. One class of phytochemicals are polyphenols. Polyphenols are a large group of micronutrient compounds found mostly in plants, including fruits, vegetables, nuts, seeds, and cereals, as well as natural nutraceuticals such as MLG-50 fulvic mineral powder, or beverages such as tea, coffee and wine[1]