What are the benefits of sea salt hot compress? What is sea salt? Can you buy it in the market?

Sea salt is a salt directly precipitated from seawater and has not been carefully processed. The original salt used in kitchens in the last century was sea salt. Taking sea salt after frying can relieve intestinal spasm or dysmenorrhea. Salt has a large specific heat, absorbs more heat when heated, dissipates heat slowly when used for hot compress, and the temperature duration is longer than that of hot compress with towel or hot water bottle. Because it is inedible, the hygiene requirements are low and there is no special requirement for iodine content. At present, there is no such crude salt on the market. In fact, the hot compress effect of iodized salt bought in the vegetable market is the same.