DEAR DR. BLONZ: What is known about the Ganoderma mushroom that gets roasted and used as a coffee substitute? For example, a number of mushroom compounds are being investigated for effects on cancer when taken alone or used in conjunction with more conventional therapies. The beverage you mention is made from roasted Ganoderma, its full name being Ganoderma lucidum, more commonly known as the reishi mushroom. Could there be potential interactions with health conditions, medications or other dietary supplements? If you have ongoing health conditions and are taking meds, please run this by your health practitioner and your pharmacist and track what happens.