You are so right about magnesium for itching! My sister was constantly itching and scratching all over her body for many months. Her doctor told her to try cleaning out her system with a laxative. She took an enema and a pill form laxative but that didn't work. An older relative of our family recommended Epsom Salt. Within hours of cleaning her system with Epsom Salt, her itching stopped. We believe she was very low in magnesium. Now, she sprays her feet once a week with a magnesium spray and the problem has not returned. It was such a relief because she suffered greatly with this affliction.