Used as a laxative to relieve constipation by drawing water into the intestines and stimulating bowel movements. Commonly applied in cases of acute constipation or to prepare the bowel before medical procedures. Employed in agriculture to correct magnesium deficiency in soil, promoting healthy plant growth, especially in crops like tomatoes, potatoes, and roses. Utilized in medicine to manage seizures in pregnant women with preeclampsia or eclampsia. Also given to treat low magnesium levels in the blood and to reduce the risk of preterm labor. Applied in bath salts to soothe sore muscles and relieve minor aches, though absorption through the skin is limited. Used in brewing and fermentation processes to adjust water hardness and supply essential magnesium for yeast activity. Commonly included in aquarium care to maintain magnesium levels in marine and reef tanks, supporting coral and invertebrate health.