Puerarin, one of several known isoflavones, is found in a number of plants and herbs, such as the root of Pueraria (Radix puerariae) notably of the kudzu plant. Puerarin, one of several known isoflavones, is found in a number of plants and herbs, such as the root of Pueraria (Radix puerariae) notably of the kudzu plant. Puerarin is the 8-C-glucoside of daidzein.