75-year-old Ozzy Osbourne undergoes stem cell therapy for spinal issues and Parkinson's disease.

75-year-old rock legend Ozzy Osbourne is undergoing stem cell therapy for his spinal issues and Parkinson's disease. Stem cell treatments are largely experimental for conditions other than certain blood and immune system cancers, approved by the FDA. Experts warn that stem cell therapy isn't a guaranteed solution for Parkinson's and advise caution, urging thorough research and against "stem cell tourism".