For purposes of cellular detoxification and tissue purification, the most 
effective  form of 
magnesium is magnesium chloride, which has a strong 
excretory effect on  toxins and stagnant energies stuck in the tissues of the 
body, drawing them out  through the pores of the skin. Chloride is  required to 
produce a large quantity of gastric acid each day and is also needed to 
stimulate  starch-digesting enzymes
. 
 According to Daniel Reid, 
author of 
The Tao of Detox, magnesium sulfate, commonly known as Epsom 
salts,  is rapidly excreted through the kidneys and therefore difficult to 
assimilate. This  would explain in part why the effects from Epsom salt baths do 
not last long  and why you need more magnesium sulfate in a bath than magnesium 
chloride to  get similar results. Magnesium chloride is  easily assimilated and 
metabolized in the human body.