Seeds of N. sativa (Ranunculacaea), roots of H. indicus (Asclepiadaceae), and rhizome of S. glabra (Smilacaceae) were purchased and authenticated by the botanist at the Bandaranayaks Memorial Ayurvedic Research Institute (BMARI), Nawinna, Maharagama, Sri Lanka. Voucher specimens (UKFM/B/2006/01, UKFM/B/2006/02, and UKFM/B/2006/03) have been deposited at the Department of Biochemistry and Clinical Chemistry, Faculty of Medicine, University of Kelaniya, Sri Lanka.