Flor-Essence和 Essiac~(TM)是北美癌症病人使用最广泛的两种草药滋补剂,有液体制剂和干草药茶两种剂型,主要成分是牛蒡、掌叶大黄、酸模和糙枝榆,次要成分是豆瓣菜、地中海蓟、红车轴草和掌状海带。这两种药在加拿大已有30年历史了,同时也争论了30年,约35%癌症病人服用它们。在美国,38%癌症病人服草药制剂,也有4.9% Flor-Essence and Essiac(TM) are the two most widely used herbal tonics for cancer patients in North America, including liquid preparations and dry herbal teas. The main ingredients are burdock, Rhubarb, Sorrel and rough branches. The ingredients are watercress, Mediterranean sea bream, red clover and palmate kelp. These two drugs have been in Canada for 30 years, and they have also been debated for 30 years. About 35% of cancer patients take them. In the United States, 38% of cancer patients take herbal preparations, also 4.9%