What is Ganoderma extract?

Ganoderma lucidum extract is a substance found in reishi mushrooms that is used as an alternative treatment for swine flu, allergies, asthma and stomach ulcers, according to WebMD. The extract is taken from the mushroom tops and filaments. It is also used to manage chronic fatigue syndrome and insomnia.

Drugs.com explains that Ganoderma extract contains polysaccharides that may help to prevent certain cancers by boosting the immune system. Individuals with rheumatoid arthritis and cardiovascular conditions may also benefit from taking 5.4 grams of Ganoderma on a daily basis. Mild side effects of the extract include skin irritations, gastrointestinal discomfort and faintness, according to Drugs.com.