A study of the periodic table of elements shows:
sulfur, selenium, and tellurium
as being the only three oxygen transport minerals.
Further study shows that:
chlorine and fluorine
are detrimental to such oxygen transport, yet these elements have been added to make our teeth “healthier” and our water “more pure” or free from bacterial infestation.
These elements are poisonous at higher concentrations, and they block the uptake of both oxygen and sulfur. Drinking city tap water is discouraged for this reason.