Dandelion (Taraxacum officinale) is an herb native to Europe. The leaf, flower, and root have been used for various infections, but with little evidence. Dandelion is found throughout mild climates of the northern hemisphere. It contains chemicals that might decrease swelling, increase urine production, and prevent crystals from forming in the urine that could lead to infections in the kidneys and urinary tract. People use dandelion for conditions such as swollen tonsils, kidney infections, UTIs, and many others, but there is no good scientific evidence to support these uses.