Black salt, also known as kala namak or Himalayan black salt, is found in India. It comes from the salt mines of India, Pakistan, Bangladesh, Nepal, and other Himalayan locations. Black salt was first used in Ayurvedic medicine for its holistic, therapeutic properties. It is filled with minerals that are insoluble, making them harder to be absorbed by the body. Now, black salt is commonly used in cooking and is a popular ingredient in Indian recipes. It has volcanic origins and is made up of sulphur compounds which contribute to its smell and taste. It is also made up of iron and potassium chloride.