Usnea - 59ml | Supreme Nutrition ProductsUsnea is a liquid food supplement containing usnea lichen, often associated with Usnea barbata, a material long used in traditional herbal preparations. Usnea naturally contains usnic acid together with polyphenolic and lichen derived constituents characteristic of the material. The tincture format provides the ingredient in a concentrated liquid presentation. This formulation is intended for use as part of a varied and balanced diet and healthy