There is no sodium in Natural Calm. Magnesium citrate is called an organic “magnesium salt” in chemistry terms, like sodium chloride (table salt), but the two are very different. “In chemistry, a salt is an ionic compound that can be formed by the neutralization reaction of an acid and a base. Salts are composed of related numbers of cations (positively charged ions) and anions (negative ions) so that the product is electrically neutral (without a net charge).” (Wikipedia)  These component ions can be inorganic, such as chloride, or organic, such as citrate.