Most studies show that people with fibromyalgia have low D3 levels. Low magnesium is also an issue, hence the cramps and restless legs. Magnesium is needed to help convert D3 into calcitriol. The two together would prevent the issues with calcium. Many doctors in the U.K. give elderly people calcium tablets, this creats more problems than it solves, as many do not add magnesium which is needed for calcium to be absorbed and used properyby the body.

Vitamin D by itself may make you feel more cheerful and energetic. Combined with magnesium and calcium, it could significantly reduce muscle pain and cramps. I've been using it for years and it's how I keep my pain under control. I don't take any medications.

iv low vitamin d been on supplements for 6 mths, gotta have blood test this wk to see how im doing, made no difference to my fibro

A lot of ppl with out fibro are low vit d too. But It could definitely help you.

Welcome to my world lol. I couldn't take the huge doses the doctors advise all at once so I take 3000 mg a day at dinner time since vitamin d3 is fat soluable--so it's better to take it with a large meal for absorption. Doesn't help my pain any but WOW does it help my energy. Magnesium helps more with the muscle pain for me. And yes, keep an eye on your Calcium levels if you take massive dosages.