High dose folic acid encourages hair growth. It may also revert some gray back to natural but that depends on the person.

When nerves heal they may do weird things...overreact etc.

But magnesium is really a good thing to take for nocturnal leg cramps. You will want to make sure you get daily calcium as well.

I'd get a test at the doctor's for Vit D levels. People with chronic pain often have low D. When D is low, then the calcium you do eat does not get absorbed well. Calcium + magnesium in a good balance is needed for preventing cramping. Some say 2:1 is the ideal ratio. Calcium:magnesium.