A 5.2 ounce bag of Cordyceps mushroom powder, of the CS-4 strain. The Botanical name is Cordyceps Sinensis. The Chinese Pin Yin name is Dong Chong Xia Cao. Myriad Mycology mushroom powder is made from finely ground mushroom mycelium. They are cultivated in a sterile laboratory from hand picked and vigorous strains of the noted medicinal species. Through rigorous quality control a standardized level of growth is achieved before the species are processed into a bio-available form for consumption. Myriad Mycology makes all of their powders with proprietary steam extract methodologies to ensure a high degree of water soluble constituents, such as polysaccharides, are bioavailable in the end product. Other ingredients: myceliated brown rice. Mycelia are the vegetative part of a fungus, consisting of a network of fine white filaments. Brown rice is the growing medium, rather than sawdust or manure. The rice is consumed by the mycelia. It is not a filler. This is full disclosure regarding the ingredients. Mushrooms are considered to be biological response modifiers, a substance that arouses the body's response to an infection and enhances the activity of the immune system. Corcyceps has traditionally been used around the world to benefit virility, endurance, energy, and alertness. Cordyceps is now favored by Olympic athletes and training enthusiasts to support physical performance and stamina, as well. The CS-4 strain of cordyceps is the most highly researched strain. This mushroom is discussed in Stephen Buhner's book, Healing Lyme.