Vitamin A and vitamin E in human blood

Abstract

The work to be described in these communications followed earlier studies For purposes of comparison it was desired to know the levels of vitamin A prevalent in normal subjects, and the advisability of obtaining more adequate information became apparent. It was known that the blood vitamin A varied widely in different normal individuals, and that men tended to have higher levels than women (Kimble, 1938-9), but knowledge was scanty on the influence of age or season of the year. Moreover, at the time of our earlier work, dietary restrictions, imposed during the Second World War, were still in force in this country. It was of interest, therefore, to study the effect on the blood vitamin A of the changes in the national food supplies which followed the gradual relaxation of controls.