Houttuynia cordata Thunb (Saururaceae; H. cordata)com-monly known as “Pak Kan Thong” in Thai, is a popular side-dish vegetable, which is consumed in the Northern and Eastern regions of Thailand. Its medicinal properties in the treatment of chronic sinusitis and allergy are accepted in several Asian countries including Korea, Taiwan and China (Lu et al. 2006a; Ng et al. 2007; Han et al. 2009). Recent inves-tigations have documented H. cordata for treatment of a number of physiological and immunological disorders, such as anti-allergy (Li et al. 2005; Han et al. 2009), antioxidant (Chen et al. 2003; Park et al. 2005; Kusirisin et al. 2009) and anti-leukemia (Chang et al. 2001).