In our in vivo study, samples pretreated with 1000 mg/kg BW of PLE showed no sign of toxicity, and showed hepatic protective effects from hematologic and histological determinations. According to a previous study (Reagan-Shaw et al., 2008), Food and Drug Administration has suggested that the extrapolation of animal dose to human dose may be based solely on normalization of body surface area ratios (g/m2).