Frequent Infections
Vitamin D plays an essential role in keeping the strength of your immune system. A deficiency of this mineral can reduce your ability to fight against bacteria and viruses causing illnesses. So, if you become sick more often, particularly with the flu or colds, then a low level of vitamin D might be a possible cause. Many studies have also shown an association between this condition and respiratory infections, such as pneumonia, bronchitis, and colds. Taking high-dose supplements for an extended period can be a good option to deal with this issue. [2]
