Oyster mushrooms modulate the immune system, inhabit tumour growth and inflammation, have hypo-glycaemic and antithrombotic activities, lower blood lipid concentration, prevent high blood pressure and atherosclerosis, antimicrobial and other activities Edible mushrooms have been treated as important tools in modern medicine for their medicinal values. Anti-cancer medicine (Leutinan) is produced recently by some chemical companies from the extract (polysaccharides) of mushroom.