Supplements Chromium is present in some of the more comprehensive multivitamin and mineral formulations. Forms such as chromium yeast and chromium polynicotinate are said to mimic more closely the natural GTF-complexed form. However, insulin-dependent diabetics should not take chromium without medical advice. Manganese Manganese aids in the development and maintenance of healthy bones and in the synthesis of substances called mucopolysaccharides that surround and lubricate the joints. The mineral is also required for sex hormone synthesis and is involved in antioxidant activity within the body.
Tea is estimated to provide half the amount of manganese in the British diet.
Whole grains, nuts and avocados are rich sources, with other fruits and vegetables also containing moderate amounts. Deficiency Manganese intakes have been estimated at around 4.6mg per day so there is little evidence of deficiency. Iodine Iodine is essential for the formation of thyroid hormones. The mineral is therefore needed to control the production of energy, promote growth and development and help burn fat. The best dietary source of iodine is fish and seafood, but bread and dairy foods are the main sources in the British diet.