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Vitamin D is often referred to as the ‘sunshine vitamin’, because our body produces it when it is exposed to sunlight. Most people can produce enough vitamin D from sunlight from late March or early April to the end of September. But it's often difficult to get enough from the sun alone for the rest of the year.

Good gut health is essential to supporting our immune system – which is vital during the colder months as 70 per cent of our immune cells reside in our gut. These gut microbiota play a major role in our body’s defence system; they are the ‘gatekeepers’ to our immune system, training our immune cells which bacteria to fight off and which substances to leave alone. Essentially, the 'good' bacteria in our gut compete with 'bad' bacteria and viruses for space and nutrients. The gut microbiota helps to keep these bad pathogens at bay by stopping them from colonising.