the bitter substance quassin extracted from its bark.
the appropriate dose of quassia depends on several factors such as the user's age, health, and several other conditions. at this time there is not enough scientific information to determine an appropriate range of doses for quassia. keep in mind that natural products are not always necessarily safe and dosages can be important. be sure to follow relevant directions on product labels and consult your pharmacist or physician or other healthcare professional before using. medicinenet.com