Here is a study that shows the potential value of vitamin D against fibromyalgia. In this placebo-controlled study involving 30 women with fibromyalgia, oral supplementation with cholecalciferol (vitamin D3) for 20 weeks was administered with a goal of achieving serum calcifediol between 32 and 48 ng/mL.
Results found a marked reduction in pain over the treatment period in
the group treated with vitamin D, and a significant group effect was found
according to visual analog scale scores, which was correlated with scores on
the physical role functioning scale of the SF-health survey 36.
"Optimization of calcifediol levels in fibromyalgia had a positive effect on the
perception of pain."
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Source: Effects of vitamin D on patients with fibromyalgia syndrome: A randomized placebo-controlled trial