This is an excellent compilation of studies and a good presentation. However it drove me to the exact opposite conclusion. There is a large amount of observatio

This is an excellent compilation of studies and a good presentation. However it drove me to the exact opposite conclusion. There is a large amount of observational evidence for Vit-D. The interventional data is mixed or weak. This all strongly points to Vit-D as a marker and not a factor. I continue to take my Vit-D though less diligently but instead have made a conscious effort to get sun exposure. Even in the north east winter, it is possible to get sun a few days a week. The mechanism behind what the Sun does to the body is complex and best to be safe.