Hi, I have a rare disease Adrenomyeloneuropathy and I suffer muscle spasms in my arms and legs and I have found that Vitamin D3 stops them! however vitamin d uses magnesium to be converted to it's active form in the bloodstream and after taking it for 2 months it has caused Magnesium dificiency! so I have started using Pink Himalayan Salt because supplements are not absorbed very well and when soaking in a bath your body will absorb what it needs, I use about a kilo in a bath for 30mins and it has relieved my neuropathic pain.
All the best
Steve