Hibiscus, also known as Hibiscus sabdariffa, is a perennial plant native to tropical and subtropical regions. The calyxes or sepals of the plant are used for medicinal purposes. Hibiscus has been traditionally used to help lower blood pressure, it's also believed to have hypotensive properties. It is also traditionally used to help reduce symptoms of anxiety and depression, it's also believed to have anxiolytic properties. It is also traditionally used to help improve digestion and to help reduce symptoms of constipation. It is also believed to have antioxidant properties and may help to protect cells from damage.