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Potassium is a mineral found in most types of food. Good sources of potassium include fruit (such as bananas), vegetables, pulses, nuts and seeds, milk, fish, shellfish, meat, poultry and bread.
You should be able to get all the potassium you need from your daily diet. Adults need 3500 mg a day.
Potassium has many important functions. It controls the balance of fluids in the body and may help to lower the blood pressure.
Taking too much potassium can cause stomach pain, nausea and diarrhoea.
You should be able to get all the potassium you need by eating a varied and balanced diet. If you decide to take potassium supplements it is a good idea not to take too much because this could be harmful.
Taking 3700 mg or less of potassium supplements a day is unlikely to cause any harm.
Older people may be more at risk of harm from potassium. This is because, as we get older, the kidneys become less able to remove potassium from the blood. Older people should only take potassium supplements on medical advice.