Usneas usnic acid has shown effective anti-microbial activity against fungus trichomonas protozoa gram-positive bacteria (e.g. staphylococcus streptococcus and pneumonococcus including penicillin resistant strains) and tuberculosis bacillus. Usnic acid shows no antimicrobial activity against gram-negative bacteria (e.g. E. coli and salmonella). Helps to increase resistance against colds and flu.Other products from HerbsPro