Rooibos is grown only in a small area in the region of the Western Cape province of South Africa. Two rooibos flavonoids, quercetin and luteolin have been known to have cancer fighting qualities. Also, rooibos is one of only a handful of plants in the world to contain EGCG epigallocatechin-3-gallate, a potent antioxidant which can decrease heart disease risk. (