The biochemical in the shiitake mushroom that has been proven to augment immune system activity is called lenitan. Today it is possible to find shiitake mushrooms in many supermarkets and Asian groceries in the dried form. Fresh ones are also available in some co-ops. As a food and a spice, garlic is used widely in both the East and the West. Garlic contains allicin which has antibiotic and anti-fungal properties.
People call it a natural chemotherapy drug because of the way it destroys cancerous cells.
It is especially preventive of colon and stomach cancers. One of garlic s components, ajoene, is very toxic to malignant cells. The maximum benefit is achieved by eating raw garlic. Kelp is a seaweed which tops the list of therapeutic Chinese foods for its anti-cancer properties. It is rich in many minerals and other special nutrients such as iodine.