Regular table salt usually comes from salt mines and is refined until it is pure sodium chloride. Sea salt is typically not as refined so it still contains traces of other minerals, including iron, magnesium, calcium, potassium, manganese, zinc and iodine.
While sea salt is sometimes promoted as a healthful alternative to regular table salt, the sodium content is essentially the same. The advantage is that some people use less when cooking or finishing with sea salt.
Bottom Line: All salt has sodium; therefore, use sparingly.