Nigari, or Natural Magnesium Chloride, is a traditional Japanese product used mainly as a coagulant to manufacture tofu.
It is obtained by filtering, centrifuging, and concentrating seawater to form Nigari crystals, which are then broken and packaged.
In addition to making tofu, it is commonly used as a natural source of magnesium in the form of chloride. Magnesium reduces muscle spasms, regulates calcium metabolism, and treats bone and joint problems.