One of the essential minerals in the human body is salt. how much salt (nacl) is in the average adult human body?

The human body contains many salts, of which sodium chloride NaCl is the major one, making up around 0.4 per cent of the body's weight. So a 50kg person would contain around 200g of sodium chloride - around 40 teaspoons. Since we lose salt whenever we sweat, it has to be continually replaced.

0.4% of body weight.

//Not sure, but hope it helps.