Trivalent chromium has been deemed to be an essential trace element,
but lack of proof suggests that it is merely benign.
It isn’t necessary for anyone to take chromium supplements
who eats food prepared in stainless steel cookware,
and those who are allergic to chromium or nickel are advised
to cook with aluminum, enameled, or cast iron cookware.
See also in The book of science:
Readings on wikipedia: