In the US white button mushrooms represent 90 percent of the total mushrooms consumed. We suggest you keep on eating them. Recent studies done by Agricultural Research Service (ARS) scientists have concluded a study showing that white button mushrooms enhanced the activity of critical cells in the body's immune system. Results of the study suggest that white button mushrooms may promote immune function by increasing production of antiviral and other proteins that are released by cells while seeking to protect and repair tissue. So we suggest you keep a supply of our dried button mushrooms (champignons) on hand to use whenever a dish calls for the addition of the button mushrooms. Your good health depends on it!