Rooibos (pronounced ROY-boss) tea is a red herbal tea that comes from the fermented leaves of the Aspalathus linearis shrub, a plant native to South Africa. Rooibos tea has a sweet, delicate, and earthy flavor. It contains several antioxidants and free from caffeine, which may make it a good option trusted Source for pregnant people, children, and those who are sensitive to caffeine.