For internal cleansing and to promote a healthy digestive system, Dr. Tennant's Activated Bamboo Charcoal is like a cleansing sponge with its millions of tiny pores soaking up and trapping toxins and impurities as it moves down the GI tract detoxifying everything in its path. Activated charcoal is a fine, odorless, black powder often used in emergency rooms to treat overdoses because of its toxin-absorbing properties. The body is unable to absorb charcoal, so it is eliminated along with all the bound toxins it finds as it moves through the GI tract.