Mo Yao (Myrrh Resin); Commiphora Myrrh, Myrrha The resin of Mo Yao or Myrrh, almost inseparable from Ru Xiang (Frankincense resin) due to their synergistic effect, is bitter with a neutral energy. It belongs to the TCM class of herbs that invigorate the blood. With Frankincense, it forms a combination that is part of the base ingredients in many bruise liniments. Properties Bitter, neutral Channels Entered Heart, Liver, Spleen