Figure 3

Schematic diagram of the human study design. Six different test meals consisting of bouillon fortified with isotopically labeled [⁵⁴Fe]-SO₄, [⁵⁷Fe]-PP and [⁵⁸Fe]-PA-HCP, respectively, each with and without the addition of an inhibitory corn meal rich in phytate, were randomly administered on study days 1, 2, 3, 17, 18 and 19.