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Chromium
Chromium is an extremely important mineral if you have PCOS. It helps to encourage the formation of glucose tolerance factor (GTF) which is a substance released by the liver and required to make insulin more efficient. A deficiency of chromium can lead to insulin resistance, which is a key problem in the case of PCOS; too much insulin can be circulating but it is unable to control your blood sugar (glucose) levels.

Chromium is the most widely researched mineral used in the treatment of overweight. It helps to control cravings and reduces hunger. Chromium also helps to control fat and cholesterol in the blood. One study showed that people who took chromium over a ten-week period lost an average of 1.9kg (4.2lb) of fat while those on a placebo (sugar tablet) lost only 0.2kg (0.4lb)
Warning
If you are diabetic and on medication, you should speak to your doctor before taking chromium.

Zinc is an important mineral for appetite control and a deficiency can cause a loss of taste and smell, creating a need for stronger-tasting foods, including those that are saltier, sugarier and/or spicier (in other words, often more fattening!). Zinc is also necessary for the correct action of many hormones, including insulin, so it is extremely important in balancing blood sugar. It also functions together with vitamins A and E in the manufacture of thyroid hormone.

Magnesium
Magnesium levels have been found to be low in people with diabetes and there is a strong link between magnesium deficiency and insulin resistance. It is, therefore, an important mineral to include if you are suffering from PCOS.

B vitamins
The B vitamins are very important in helping to correct the symptoms of PCOS. Vitamins B2, B3, B5 and B6 are particularly useful for controlling weight, and here's why: Vitamin B2 helps to turn fat, sugar and protein into energy. B3 is a component of the glucose tolerance factor (GTF), which is released every time blood sugar rises, and vitamin B3 helps to keep the levels in balance. Vitamin B5 has been shown to help with weight loss because it helps to control fat metabolism. B6 is also important for maintaining hormone balance and, together with B2 and B3, is necessary for normal thyroid hormone production. Any deficiencies in these vitamins can affect thyroid function and consequently affect the metabolism.