Oyster mushrooms contain Pleuran, a substance effective for fighting cancers, lowering cholesterol, relieving low-back pain, cramps and limb paralysis, and strengthening the immune system. The nutrients contained in oyster mushrooms are effective for everyone, children or adults. Oyster mushrooms prevent the excessive absorption of nutrition, obesity, constipation, hypertension, diabetes, and various adult diseases and cancers due to poor eating habits such as overeating. As most mushrooms are effective in fighting against cancers, oyster mushrooms also drew world-wide attention as research showed that oyster mushrooms stop the expansion of cancer cells in breast and rectal cancers by improving immune functions.