D3. Although widespread pain is multifactorial and deserves an md evaluation, in terms of vitamins vitamin d imsufficiency can be a cause. If an md excludes more serious causes of pain consider taking vitamin d3 5000 units per day.
Vitamins. Research has been done looking at magnesium supplements as well as same (supplements containing Amino Acid derivatives) in fibromyalgia pain, however results were inconclusive. Further research needs to be done. A well balanced meal and staying well hydrated (with water) is most important.