NOW® Liquid Magnesium with Trace Minerals is a natural mineral concentrate sourced from the Great Salt Lake and produced by using a proprietary solar evaporation process. This process also removes 99% of the naturally occurring sodium, while preserving its remaining 72 naturally occurring Trace Minerals in their bioavailable ionic forms. The presence of Magnesium and other trace minerals in the body is necessary for normal biochemical reactions, maintenance of healthy electrolyte balance, and healthy neuro-muscular function.*