I came across this article in my Medscape feed, it's the professional version so may be behind a subscription/qualification wall.
medscape.com/viewarticle/96...
Essentially the study has shown a link between Vitamin D supplementation and cutting the risk for auto-immune disease, PMR actually gets a mention! I'm wondering if such supplementation may also cut the risk of flares. If members are unable to read this I'll try and do a cut and paste of salient sections.