Osha is a Native American plant in the parsley family that grows at very high altitudes. Herbal preparations are made from the dark brown root; other parts of the plant have been used as a cooking spice. Osha is becoming increasingly popular for its apparent antiviral and immune boosting properties. Its primary use is to alleviate sore throats, colds, and coughs. Herbalists report that osha tends to induce sweating, promote the expulsion of mucus from the lungs, and eliminate toxins.