Often taken in capsules, a suggested dosage is 225 mg of white willow bark four times daily, but follow package directions on capsules and tinctures. It is hard to judge the amount of salicin in the bark, a bark tea can normally be taken 3 to 4 times daily, a daily cup or two of willow bark tea would probably provide the equivalent of the low aspirin dose recommended for heart attack prevention.
Use the chopped bark, not the powdered bark to make your tea. Add ginger, anise, or cinnamon to enhance the flavor. Tinctures of willow bark (1-2 dropperfuls/1-2 ml) are highly effective way to take the herb. White willow is best when used over long periods of time.