Australian researchers studied over 400 older adults who were deficient in vitamin D but otherwise healthy. All had symptomatic knee osteoarthritis. They were randomized into two groups: one received oral Vitamin D3 supplements, the other a placebo. While vitamin D levels increased over the 24 month study period, pain score and knee architecture did not differ between groups.
PositiveTip: Adequate vitamin D is essential, but supplements are not all always effective.