Agaricus Blazei

Agaricus blazei is the popular commercial name for a cultivated edible mushroom whose correct scientific identity is Agaricus subrufescens, a species first described in North America by Charles Peck in 1893 ^[1]. When a mushroom grown in Brazil became popular as a health food in the late twentieth century, it was labeled Agaricus blazei Murrill, but genetic analysis later showed that the Brazilian and North American cultures are the same organism, so the older name subrufescens takes priority ^[1]. It is variously sold as the almond mushroom, royal sun agaricus, himematsutake, and cogumelo do sol, and owes its sweet, almond-like scent to aromatic compounds such as benzaldehyde ^[1].

The mushroom is native to the northeastern United States and adjacent Canada and has since been recorded across many countries, while large-scale cultivation is centered in Brazil, Japan, and other parts of Asia ^[1]. Like other members of its family it is rich in cell-wall polysaccharides, notably beta-glucans, and researchers have also isolated distinctive ergostane-type molecules named blazeispirols from its cultured mycelium ^[4]. These constituents are the basis of interest in the mushroom as a source of potentially bioactive compounds ^[4][2].

Agaricus blazei has been promoted in complementary medicine for immune support and for cancer, but such claims are not backed by sufficient high-quality clinical research ^[2]. Laboratory and animal studies have examined its polysaccharides for effects on immune cells, and small human and animal studies have looked at effects on the liver, including a report that an extract helped normalize liver enzymes in people with chronic hepatitis B ^[3] and findings that it protected rodent livers against chemical injury ^[5]. It is generally consumed as an edible mushroom or as a dried powder or extract sold as a dietary supplement rather than as an approved medicine, and it is not a regulated drug ^[1].

Generally well tolerated, with occasional digestive upset. There have been rare reports of liver enzyme changes with certain products, so people with liver conditions should be cautious and choose quality extracts. Because it stimulates immune activity, people on immunosuppressants or with autoimmune conditions should check with a doctor first.