Magnesium sulfate (MgSO4) occurs in nature and is known to us as Epsom Salts.
It is something that can commonly be found in any barn or household. It is most commonly thought of as a hoof soak for sore or bruised feet or minor sprains. As a soak, use 2 cups of Epsom Salts per gallon of water. Best if used with warm or hot water.
What we typically do not know about Epsom Salts is that they can be used internally as a laxative for relief of constipation. It can promote bowel movement in as little as 1/2 hour to 6 hours after ingestion. There are contraindications for internal use if there are any signs of kidney disease, abdominal pain or nausea and should not be used as a laxative for periods longer than one week at a time. Use with caution and with doctor's recommendation if pregnant or nursing.
It also makes a wonderful natural fertilizer for lawns, garden plants and shrubbery. It can be a useful food supplement for tomatoes, roses, lawns, evergreens, azaleas, rhododendrons, some trees and houseplants. It is best to lay the Epsom Salts down first, then water the plants.