45% magnesium chloride often more easily absorbed through the skin than taken orally magnesium oil is a thin liquid applied to the skin. NB: THIS PRODUCT IS NOW IN A GLASS BOTTLE 235ml Naturally occuring Magnesium Chloride has shown to achieve higher bio-availability than the many other forms of magnesium. Known as the 'beauty metal', topical application (transdermal) provides fast acting, high potency therapeutic benefits, as the natural pH of the skin offers the ideal environment for mangesium chlorides' complete ionisation. As one of the most vital minerals in the body, mangesium boosts almost all aspects of cell physiology, with particular importance on the healthy functioning of the nerves, muscles, heart and kidneys. *** This product is a liquid (not an oil) - this style of magnesium liquid is referred to as magnesium oil. To use cup hand and gently pump a little liquid into your palm then distribute on any body area you choose or an area of discomfort.