Morgan-Genus Sports Magnesium bath crystals are an ideal method to boost your magnesium levels in a calming and relaxing manner. Magnesium is one of the most important minerals in the human body vital to good health. Critical in over 350 essential biochemical reactions. Suitable for use on sensitive skin. Bath before physical exertion to prepare your body and afterwards to relax sore muscles and restful sleep. Relax in the bath for 30 mins to prepare your body for the day or activities ahead.