Here is some very interesting information about how transdermal magnesium chloride help boost dhea levels!
Transdermal Magnesium Therapy is the first and only book that focuses on one of the most important, exciting, and natural ways of magnesium replenishment; i.e., as absorbed through the skin. Extensive research has shown that this vital macronutrient enters the body through the skin, beneficial physiological processes occur, such as a natural increase in DHEA production, that happen no other way.
I found out that Dr. Shealy had already applied for a patent to use transdermally applied magnesium chloride to raise DHEA levels and thus extend people's life spans. His research was clear: only when magnesium is applied topically onto the skin, where it passes through that fatty tissue, are DHEA levels raised. Neither oral nor intravenous magnesium administration would do this."