Sep 09, 2019 · Manganese occurs naturally in rocks and soil and can be found in water, food, and air. Your body needs some manganese to stay healthy. The recommended daily intake for manganese depends on a person's age and . The recommended manganese intake for children over eight years old and adults varies from 1,900 to 2,600 µg per day.
Feb 16, 2010 · Manganese ore like this comes from Turkey. Carbon is a chemical element that is the primary hardening constituent in steel. Manganese is a chemical element that is present in all commercial steels, and contributes substantially to a steel's strength and hardness, but to a lesser extent than does carbon.