Our Magnesium Oil is crystal clear, highly purified and Pharmaceutical grade! This is so pure it is used intravenously in dialysis patients! Use the Magnesium Oil in a foot soak, tub soak, topically (full strength or diluted) to raise intracellular Magnesium levels. The order of absorption of Magnesium at the cellular level is: #1 Intravenous; #2 Foot soaks; #3 Bathtub soaks; #4 Direct skin application; and the LEAST effective delivery method is Oral. ALL oral Magnesium products are LAXATIVES!