Magnesium is often better absorbed via the skin, so you can also soak in magnesium salt baths or try a magnesium oil spray. (holisticsquid.com)
You can even take a bath in magnesium salts as well as taking it as a daily supplement.» (womenshealthandfitness.com.au)
I fill my tub with the hottest water I can stand and toss in an enormous amount of magnesium salt, aluminum - free baking powder, and a bit of Dr. Singha's Mustard Bath. (solfulhealth.com)