5 Take A D Supplement

Researchers found that vitamin D helped to cut the risk of colds and flu by half and was especially effective for those who were deficient in the vitamin. It’s thought to protect against respiratory infections by boosting levels of antimicrobial peptides – natural antibiotic-like substances – in the lungs. Experts recommend taking regular doses rather than intermittent high doses. Try Healthspan Vit D (£18.95 for 240 tablets, HEALTHSPAN.CO.UK).