My vitamin D usually stays very low, I take supplements. I can't get out in the sun much. I feel my skin burning after just 3-5 minutes and when I get out of the direct sun my skin feels better. It actually looks like a sunburn when in sun and goes away as soon as my skin cools back off and out of the sun.
I have heard about taking magnesium supplements but I haven't taken any yet. I may start them soon.