So the evidence is becoming quite compelling. ![]() Overall, it was only a 12% reduction, but among the participants who had profound vitamin D deficiency at baseline (such as a blood level of 25-hydroxy-vitamin D of less than 10 ng/mL), there was a 70% lower risk of respiratory infection with vitamin D supplementation. This was published in the British Medical Journal 2 years ago, showing that vitamin D supplementation was associated with a significant reduction in these respiratory tract infections. ![]() There's also evidence from a meta-analysis of randomized clinical trials of vitamin D supplementation looking at acute respiratory tract infections (upper and lower).
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