Vitamin D

The sunshine vitamin is vital for healthy bones, but also has a role in the immune system.

The analysis, published in the British Medical Journal, argues food should be fortified with the vitamin.

But Public Health England (PHE) says the infections data is not conclusive, although it does recommend supplements.

These, it says, should be taken for improved bone and muscle health.

During the bleak winter months of short days and cloudy skies, many people may seek out the benefits of sunshine in bottle form and reach for supplements of vitamin D. Made naturally by the skin when exposed to sunlight, this vitamin is needed to maintain healthy bones, teeth and muscles and to prevent them from becoming brittle and at risk of fracture.

But a review of evidence from clinical trials on the impact of supplements has found that attempting to get vitamin D through supplements is not so beneficial.