What it does: Helps rid the body of protein breakdown products, strengthens teeth and may help reduce the risk of tooth decay, detoxifies the body from free radicals, petrochemicals and sulphites.

Deficiency Signs: Deficiency signs are not known unless excess copper or sulphate interferes with its utilisation. Animals show signs of breathing difficulties and neurological disorders.

Best food sources: Tomatoes, wheatgerm, pork, lamb, lentils, beans.