Which supplements to take - and why

Selenium

What is it? An essential trace element that's an antioxidant. It's stored in the body but topped up by our diet. Selenium-rich foods include Brazil nuts (highest level by far), tuna and white fish.

Who needs it? Emerging evidence shows that selenium may reduce the risk of certain cancers, lower the risk of heart disease and improve male fertility. In the UK, the recommended intake is 60-75 micrograms a day.

Where can I buy it?  Boots and other chemists have a wide range, as do health-food shops such as Holland & Barrett