What is it? Manganese is a mineral that is found in whole grains, cereals, fruits, vegetables, and tea. It is used as a supplement for diabetes, epilepsy (seizures), high cholesterol (blood fats), Parkinson's disease, rheumatoid arthritis, and schizophrenia. Manganese is also used for strains, sprains, and inflammation (soreness and swelling). Other names for Manganese include: Manganese Sulfate, Manganese Chloride, Manganese Picolinate, and Manganese Gluconate.