Our Magnesium Chloride Flakes (Hydrated Magnesium Chloride) is hydrated from the brine of Dead Sea water. Magnesium is an essential element for the body and is best absorbed through the skin (rather than by mouth). Also, by increasing your magnesium levels by transdermal dose, your body will only absorb the amount of magnesium it requires. Magnesium Chloride has been reported to help relieve aches, pains, soreness and stress. For external use only.