Rooibos is used to make an herbal tea and grown in South Africa. Rooibos tea is becoming more popular because it has high level of antioxidants, no caffeine, and low tannin levels. Rooibos is purported to assist with nervous tension, allergies and digestive problems. Red rooibos leaves are oxidized, Green rooibos tea leaves are unoxidized. The more demanding production of green rooibos makes it more expensive.