I just found this from the Vitamin D Council: Also, readers should be aware (if they are not already) that vitamin D does not prevent all viral respiratory infections. As we noted in correspondence to our first influenza paper, rhinoviruses, the most common cause of the common cold, are not seasonal; that is, they are just as common in the summer as in the winter, and they do not have a lipoprotein coat for antimicrobial peptides to destroy....If you are already taking 5,000 IU a day and you get a cold, chances are that more vitamin D will not help much. No one should take large doses for more than a few days and then only if the infection is severe(1) However, vitamin D levels are inversely associated with upper respiratory tract infections .(2) If you haven't been taking any vitamin D, a moderate dose might help. Nevertheless, I have (mostly) gotten over my cold faster than some acquaintances, who came down with colds before I did and are still sick. (One coworker ...
Do-it-yourself health. Low-carb, mostly evolutionary.