This concept has led to the suggestion that dandelion can reduce the side effects of medications processed by the liver, as well as relieve symptoms of diseases in which impaired liver function plays a role. However, there is as yet no real evidence for any of these uses. Dandelion root is also used like other bitter herbs to improve appetite and treat minor digestive disorders. When dried and roasted, it is sometimes used as a coffee substitute. The scientific basis for the use of dandelion is scanty.
Preliminary studies suggest that dandelion root stimulates the flow of bile.
3,4,5 Dandelion leaves have also been found to produce a mild diuretic effect. The leaves may be eaten in salad or cooked. Safety Issues Dandelion root and leaves are believed to be quite safe, with no side effects or likely risks other than rare allergic reactions. However, based on dandelion root's effect on bile secretion, Germany's Commission E has recommended that it not be used at all by individuals with obstruction of the bile ducts or other serious diseases of the gallbladder, and only under physician supervision by those with gallstones. Some references state that dandelion root can cause hyperacidity and thereby increase ulcer pain, but this concern has been disputed.