There is evidence to suggest that people who are very deficient in Vitamin D are more likely to get respiratory tract infections (infections that affect the airways and lungs).
A systematic review of 25 randomised trials found that appropriate Vitamin D supplementation was safe, and that it protected against respiratory tract infections. It also found that people who were very Vitamin D deficient got the most benefit.
The HSE website outlines the correct amount of Vitamin D for people who may have Vitamin D deficiency. It is important not to take too much Vitamin D, as this could weaken bones.
The recommended level of Vitamin D supplementation according to the HSE website is 25 micrograms (0.025mg) or less a day of Vitamin D supplements. Taking 25 micrograms (0.025mg) or less a day of Vitamin D supplements is unlikely to cause any harm.
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