All studies have limitations. Here are possible limitations, as found in the study. According to Mayo Clinic, taking vitamin D supplements: Per Johns Hopkins Medicine, taking calcium supplements ...

A new study reinforces the importance of vitamin ... helping fight off disease and viruses, according to the Mayo Clinic.

This study used a small population and included data from only two centers. Additionally, because exact concentrations of vitamin E were not recorded from 1997 to 1999, we were unable to analyze ...