When our immune systems let us down, we often reach for the vitamins we should have been taking in the first place.

The phrase ‘closing the stable door after the horse has bolted’ springs to mind. While vitamins can help us boost, tune and enhance our immune response, endeavouring to avoid easily-rectified nutritional deficiencies is the best policy.

Eating a diet rich in these immune-boosting vitamins is key if you wish to not only avoid seasonal colds, but maintain a good state of health year-round.