Black salt has antioxidant properties and has surprisingly low sodium levels. It also contains important minerals like iron, calcium, and magnesium, which are essential to healthy bodies. Black salt stimulates bile production in the liver, and helps control heartburn and bloating.
Today, many black salts are made synthetically from a combination of sodium chloride, sodium sulfate, sodium bisulfate, and ferric sulfate. The salt is then mixed with charcoal and heated before the final product is ready.