4 oz. brown glass bottle. A tincture of the dried bark has an antibiotic activity against many strains of bacteria, including methicillin-resistant Staphylococcus aureus and Pseudomonas aeruginosa. Use equal portions of catkins and bark when tincturing, following the procedure described in Amoeba Infestation. Take in ½ teaspoon dosages up to six times daily.