Essiac Liquid Extract is a concentrate of 4 detoxifying and cleansing herbs. There are many forms of Essiac out there (dried herbs, liquids with added herbals and more) but this is the easiest and simplest to take. If you are using Essiac because you are fighting a serious illness, such as cancer, then easy to use is important. This formula was developed by a Canadian nurse many, many years ago and has been popular as an adjunct to cancer treatment even to this day. The herbs are powerful cleansers.