Agaricus Blazei is a medicinal mushroom that contains a special class of polysaccharides known as "beta glucans." Studies show beta glucans stimulate activity of natural killer (NK) cells, which are an important part of the immune system.

Originally discovered in Brazil, Agaricus blazei is widely consumed in many countries, where it is regarded as a health food, due to its medicinal properties.

The mushroom is used both in tea form and as a food. Since 1965, strains of Agaricus blazei have been imported to Japan, where it is now widely cultivated and researched.

Agaricus Blazei Murill (ABM) appears to have the ability to stimulate or modulate the immune system. The immunotherapeutic properties include facilitating growth inhibition and destruction of tumor cells, which may include direct cytotoxic effects on cancer cells.