Rooibos (Aspalathus linearis) is endemic to South Africa.It can be used as a herbal tea to treat diabetes in STZ-treated rats [].Aspalathin, a dihydrochalcone C-glucoside of rooibos, reduced hyperglycemia and ameliorated glucose intolerance through increased glucose uptake and insulin secretion in db/db mice [].Rutin, quercetin-3-O-rutinoside, is an inhibitor of α-glucosidase []..