Many people mistakenly think of fluoride as a mineral, and many a politician promoting fluoridation has referred to it as, “the magic mineral.” However, this is not true. Fluorine in its pure form is a gas which is the most toxic of four main halogens; chlorine, bromine and iodine. Fluorine happens to be the most tightly binding element on the periodic table, so it is mostly found as a compound clinging to something else. Fluoride binds up magnesium, and so steals it from your body. The symptoms of fluoride toxicity are the same as magnesium deficiency.
Transdermal magnesium absorption means that magnesium ions (electrolytes) can pass into the epidermis (outer layer) of the skin, which acts as a nutritional reservoir until the tiny capillaries of the dermis underneath can absorb nutrients as required. From this skin reservoir the body may also absorb the vitamin D it made when you got some sunshine on your skin.