Borvo Nutrients Magnesium Oil is Magnesium Chloride sourced from the ancient seabeds of the Zechstein, and is the highest natural quality, absorbed easily and bio-available. Our magnesium oil is exactly as it is from the source, though the Sensitive range is diluted with ionised water to reduce the Magnesium Chloride concentration. Used topically our magnesium oil is sprayed directly onto the skin enabling the amount administered to be easily regulated.