Refined table salt labelled as iodised salt contains added iodine.
Chemically all types of salt contain sodium and chloride,
regardless of whether the salt is processed from seawater
or rock salt, which is mined from the ground. Unrefined
sea salt or rock salt may contain trace amounts of beneficial
minerals such as magnesium, iodine and zinc as well as other
impurities that are present in the seawater or in the area
from which the salt was mined. However, the amount of the
minerals relative to the amount of sodium and chloride is so
small that, to be nutritionally significant, very large
amounts of the salt would have to be consumed.
Source: Salts of the earth...The Star
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