The Oyster Mushroom
The oyster mushroom is a nutrition supplement with a high concentration of selenium that strengthens your immunity. The oyster mushroom (Pleurotus ostreatus) is an edible mushroom that grows on the trunks of trees. Its tissue contains amino acids, B vitamins, minerals and trace elements (iron, magnesium, zinc, selenium, chrome and iodine). It is usually sold in the form of pastilles or tablets.