Quassia is a plant derived from the bark of the Quassia amara tree, native to tropical regions of South America and the Caribbean. It has been traditionally used for its medicinal properties, particularly as a bitter tonic and for digestive issues. The active compounds in Quassia, known as quassinoids, are responsible for its intense bitterness and potential health benefits. In addition to its medicinal uses, Quassia is also utilized as a natural insect repellent and pesticide in agriculture. Its effectiveness against pests makes it a popular choice for organic farming, as it helps protect crops without the use of synthetic chemicals.