... Formulation: Purity: 7562- 61-0C18H16O7344.32yellow crystalline powder98%, 99% Usnic acid is extracted from Usnea, Usnea, also known as old mans ... forests In natural remedies, especially in the veterinary medicine, Usnic Acid is used in powders and ointments for the treatment of ... infections of the skin. Usnic acid as a pure substance has been formulated in creams, ...