sentences:  There is limited evidence regarding its effectiveness in preventing or treating hemorrhagic and pathological conditions in both humans and animals via oral administration.The safety and efficacy of Yunnan Baiyao has not been assessed or established by the FDA, European Medicines Agency, or the Australian Therapeutic Goods Administration.In a limited number human studies of small sample sizes, administration of Yunnan Baiyao has been shown to correlate with "reduced perioperative bleeding as well as bleeding in various ulcerative–hemorrhagic conditions" .