Can Vitamin D Cure the Common Cold

13 June 2009

In the largest study yet of the association between vitamin D and respiratory infections, people with the lowest blood vitamin D levels reported having significantly more recent colds or cases of the flu. The risks were even higher for those with chronic respiratory disorders such as asthma.

This study analysed blood levels of vitamin D from almost 19,000 adult and adolescents.

Vitamin C has been used for the prevention of colds for decades, but little scientific evidence supports its effectiveness. In contrast, evidence has accumulated that vitamin D plays a key role in the immune system.

The wintertime deficiency of vitamin D, which the body produces in response to sunlight, has been implicated in the seasonal increase in colds and flu, and previous small studies have suggested an association between low blood levels of vitamin D and a higher risk of respiratory infections.

All this means that healthy adults, who typically get two colds a year, might suffer an extra one if they're vitamin D deficient. For people with asthma or COPD, who get around four or five colds annually, lack of vitamin D might tack on additional infections, but exactly how many isn’t known.

This study again highlights the importance of vitamin D in the functioning of the immune system.  In winter time, when exposure to sunlight is at an all time low supplementing with cod liver oil to boost vitamin D levels is a must!