Vitamin D for common cold and influenza (flu)
A study has said that regular intake of vitamin D supplements may help protect against cold and flu, as well as tackle high levels of the vitamin’s deficiency in countries like India.
Vitamin D, also known as the ‘sunshine vitamin’, is known to improve bone and muscle health.
A study however showed that vitamin D also protects against respiratory infections by boosting levels of antimicrobial peptides that are the natural antibiotic-like substances found in the lungs.
Acute respiratory infections such as pneumonia are a major cause of global morbidity and mortality.
‘Most people understand that Vitamin D is critical for bone and muscle health. Our analysis has found that it helps the body fight acute respiratory infection,’ said Carlos Camargo from the Massachusetts General Hospital (MGH).
For the study, the team analysed nearly 11,000 participants in 25 clinical trials conducted in 14 countries including India, Britain, US, Japan, Afghanistan, Belgium, Italy, Australia and Canada.
The findings showed that daily or weekly supplementation halved the risk of acute respiratory infection in people with most significant Vitamin D deficiency [below 25 nanomoles per litre (nmol/L)].
Administering occasional high doses of Vitamin D did not produce significant benefits.
People with higher baseline Vitamin D levels also benefited, although the effect was more modest (10% risk reduction), the researchers noted, in the paper published in the journal BMJ.
‘Our study strengthens the case for introducing food fortification to improve Vitamin D levels in countries where profound vitamin D deficiency is common,’ added lead researcher Adrian Martineau Professor at Queen Mary University of London (QMUL) in Australia.
