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A new study has shown that taking vitamin D supplements, especially in small doses during fall and winter, will help prevent catching colds, influenza and other respiratory diseases. The study titled,   Vitamin D supplementation to prevent acute respiratory tract infections: Systematic review and meta-analysis of individual participant data ,  analyzed the data from 25 clinical trials in 14 countries and on 11,321 participants, aged 0 to 95 years. “The bottom line is that the protective effects of vitamin D supplementation are strongest in those who have the lowest vitamin D levels, and when supplementation is given daily or weekly rather than in more widely-spaced doses,” lead researcher, Adrian Martineau, said in a statement. Boosting immunity The research team at Queen Mary University of London (QMUL) concluded that vitamin D protects the human body against respiratory infections, including bronchitis and pneumonia, by boosting levels of antibiotic-like peptides in the lungs. T