Supreme Nutrition Products Usnea - 59ml | Supreme Nutrition Products Usnea barbata or 'Old man’s Beard' is a lichen with a long history of being used in herbal medicine. Supreme Nutrition chose to come out with it as a tincture looking at it as a great anti-bacterial especially for respiratory infections. There are a number of active constituents found in usnea including those with antimicrobial, anti-oxidant and polyphenolic properties. It is most well known for treating certain types of infections, including those affecting the throat, respiratory tract, mouth, skin and urinary tract. Usnea has also been shown to interfere with biofilm formation and quorum sensing.