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The 4 most common stable isotope–labeled vitamin A structures. These molecules are usually administered as the retinyl acetate compounds in retinol isotope dilution and compartmental modeling studies. Top to bottom: 10, 19, 19, 19-D4-retinol; 10, 19, 19, 19, 14, 20, 20, 20-D8-retinol; 14,15–13C2-retinol; and 8, 9, 10, 11, 12, 13, 14, 15, 19, 20-13C10-retinol. D, deuterium.
