Indian black salt is considered a cooling spice in ayurvedic medicine and is recommended for many health issues such as constipation, indigestion, heartburn, bloating, flatulence, goiter, poor eyesight and hysteria, according to the book ?Herbs that Heal.? In India, black salt is sometimes recommended to people on low-salt diets due to hypertension because it?s believed to be lower in sodium content compared to regular table salt. Of course, the composition of Indian black salt varies quite a bit and depends mainly on whether it?s manufactured using traditional or modern techniques. Synthetically made black salt has a sodium content very near to regular table salt. Discuss your salt options with your doctor if you have high blood pressure.