For more than 300 years, South Africans have brewed the fermented leaves of the rooibos shrub (Aspalathus linearis ) into an herbal tea that is also commonly known as red bush tea. Its naturally sweet flavor and antioxidant content have earned rooibos tea a favored place among tea drinkers worldwide. Naturally caffeine free. Alvita Rooibos Tea is made with premium-quality, organic rooibos leaves, and produces a mildly sweet flavor and aroma. Certified Organic by QAI. Certified Gluten-Free by NSF. Certified Kosher by Star-K.