Today human cells and organs are bombarded with multiple etiological agents, which leads to multiple disorders. One of the reasons is oxidative stress. Ganoderma lucidum is a fungus with an edible fruiting body. This fungus had a very good medicinal effect rather than a nutritional effect. It also had antioxidant nutrients, which prevent oxidant based disorders like cancer, heart disorders etc.,. This book provides scientific facts on Ganoderma lucidum. This book is prepared for the benefit of research students.