Quassia is a common ingredient in herbal bitters, The bitter bark acts as a digestive aid, an insecticide, and has been used for liver and gallbladder support.
Quassia is well-known and considered one of the best stomach bitters. It is useful for cases of lack of appetite such as anorexia nervosa and digestive sluggishness
It is used to prevent disease in apple trees. The wood is also used as a flavoring in the food industry.