Synergistic effect ofmixed herbal extracts has been reported before,
so it is of great importance to determine whether the bioactivity observed
is due to isolated molecules or it is rather a consequence of a synergistic
effect between several molecules contained in the extracts
(Bhuvaneswari and Balasundaram, 2006; Harikrishnan et al., 2009a,
2010; Ji et al., 2007b).