Why you need it
Manganese is a cofactor for enzymes involved in carbohydrate, amino acid, and cholesterol metabolism, as well as cartilage and bone formation. It's part of superoxide dismutase, an antioxidant enzyme that protects mitochondria.
Where to find it
A diet rich in whole grains, nuts, legumes, and leafy greens usually covers your needs. Manganese deficiency is rare.