The Magnesium Bone Mineral Lotion has been absorption tested by the team at Cardiff University. The formulation offers the first proven alternative to traditional tablets. Our dermatologically tested formula is free from parabens, synthetic fragrance and colour. Optimal absorption: Innovative water in oil formulation to ensure optimal transdermal absorption. How transdermal magnesium supplements work: Formulated for topical use and applied directly on to the skin, Magnesium Bone Lotion is absorbed into the highly porous epidermis and through to the blood vessels and muscles beneath. Completely bypassing the digestive system where many nutrients are not absorbed. Transdermal magnesium offers a simple and scientifically proven method of magnesium supplementation. Magnesium quality: Containing 100% natural ingredients, delivering the purest form of Zechstein Inside magnesium chloride. Mined in Northern Holland from a seam one mile below ground, our magnesium chloride has been naturally condensed and purified for over 250 million years. As some open water sources contain elevated man-made pollutants and heavy metals, Zechstein Inside magnesium chloride guarantees a naturally pure source of magnesium.