As far as I know Dandelion and Burdock is/was based on Dandelion root. The leaves of the Dandelion are used as a mild diuretic.

I usually steer clear of non-sugar soft drinks, though. Saccharin was used in this type of drink for year before many countries banned it as a suspected carcinogen. Aspartame, a modern chemical replacement, has been blamed for many illnesses.