Dimethyl sulfoxide (DMSO) is an organosulfur compound with the formula (CH3)2SO. This colorless liquid is an important polar aprotic solvent that dissolves both polar and nonpolar compounds and is miscible in a wide range of organic solvents as well as water. It penetrates the skin very readily, giving it the unusual property for many individuals of being secreted onto the surface of the tongue after contact with the skin and causing a garlic-like taste in the mouth. Wikipedia, Dimethyl sulfoxide
The above article is quite biased. Do your own research.
The Persecuted Drug: The Story of DMSO, 1979, by Pat McGrady, Sr. The inside story of what some call "tomorrow's 'aspirin'. A miraculous drug finally recognized by the FDA in certain cases, DMSO may prove to be the cure-all of the future!
Annals of the New York Academy of Sciences, Volume 141, Art. 1, Biological Actions of Dimethyl Sulfoxide, pages 1-671; New York Academy of Sciences, symposium March 14-16, 1966; published 1967.