“…Abnormal liver function was observed in 17 trials (Zhao et al, 2003 ; Liu et al, 2004 ; Deng et al, 2005 ; Zhang et al, 2007 , 2017 ; Wang and Liu, 2008 ; Xiong and Tang, 2009 ; Xia and Huang, 2010 ; Jiang et al, 2012 ; Su, 2012 ; Wang, 2012 ; Ruan and Zheng, 2013 ; Yue, 2013 ; Li et al, 2014 ; Wu et al, 2014 ; Mou and Hu, 2017 ; Zheng et al, 2018 ), and the cases were less frequent in the TGP group compared with the control group. Fourteen trials reported diarrhea (Wu et al, 2002 ; Zhao et al, 2003 ; Liu et al, 2004 ; Wang and Liu, 2008 ; Xiong and Tang, 2009 ; Xia and Huang, 2010 ; Jiang et al, 2012 ; Su, 2012 ; Wang, 2012 ; Ruan and Zheng, 2013 ; Yue, 2013 ; Zhang, 2015 ; Zhang et al, 2017 ; Zheng et al, 2018 ), and the occurrence in the TGP group was higher than in the control group. Gastrointestinal disorder was recorded in 12 trials (Wu et al, 2002 ; Liu et al, 2004 ; Zhang et al, 2007 ; Wang and Liu, 2008 ; Xiong and Tang, 2009 ; Xia and Huang, 2010 ; Jiang et al, 2012 ; Su, 2012 ; Yue, 2013 ; Zhang, 2015 ; Mou and Hu, 2017 ; Zheng et al, 2018 ) and the pooled results showed a reduction of gastrointestinal disorder in the TGP group.…”