Minor minerals (trace elements): sulfur, iron, chlorine, cobalt, copper, zinc, manganese, molybdenum, iodine, and selenium.

Trace minerals are needed in very small amounts: recommended daily intake is in milligrams (mg) or micrograms (mcg) per day.

Trace Elements

Trace minerals are needed in very small amounts (recommended daily intake, milligrams (mg) or micrograms (mcg) per day: 

1. iron, Fe (15 mg) - metal, found in nearly all living organisms;
2. zinc, Zn (8 - 11 mg) - metal, essential for humans and other organisms;
3. manganese, Mn (5 mg) - metal, toxic essential trace element;
4. fluorine, F, fluoride ion, F− (3 - 4 mg) - a beneficial poisonous element, essential for bone solidity;
5. copper, Cu (2 mg) - metal, essential to all living organisms;
6. iodine, I (150 mcg) - a key component of thyroid hormones;
7. selenium, Se (35 mcg) - toxic in large doses, essential micronutrient for animals;
8. chromium, Cr (30 mcg) - chromium (III) is questionably essential for humans.