I have never heard of this before. I gather that it affects the feet. A lot of us have issues with foot pain, swelling, burning, and numbness.

Mrs D- I have a spray magnesium oil (promedics neutraceuticals Ancient Minerals 3g per 30ml) that I take alongside magnesium supplements ( 50mg of elemental magnesium from mixed sources).
The oil burns when I apply it. So strange ! But man does it ever help. I heard that opiates can deplete magnesium stores, so I decided to keep on it.