Used as a laxative to relieve constipation by drawing water into the intestines and stimulating bowel movements. Commonly administered orally for short-term digestive relief. Employed intravenously in medical settings to treat magnesium deficiency, prevent seizures in pregnant women with preeclampsia or eclampsia, and manage certain cardiac arrhythmias. Applied in agriculture as a foliar spray or soil additive to correct magnesium deficiency in plants, supporting chlorophyll production and overall growth. Utilized in brewing and fermentation processes to adjust mineral content in water, influencing yeast activity and flavor profile. Sometimes added to bathwater (as Epsom salt) to soothe sore muscles and reduce inflammation, though systemic absorption through skin is minimal.