Vitamin A and vitamin E in human blood

In the first paper of this series (Leitner, Moore & Sharman, 1960) we reported values for the levels of vitamin A and carotenoids found in blood collected between 1948 and 1957 from British men and women.During 1952-7 an investigation, partly overlapping with that on vitamin A, was made on vitamin E. A preliminary paper, based on some of our earlier results, has already been published (Leitner et al. 1952).The present communication gives our results in full. E X P E R I M E N T A LCollection of specimens.Blood was collected from volunteers who could be considered normal, apart from reservations already made (Leitner et al. 1960).When the amount of blood collected was insufficient for estimating both vitamin A and vitamin E preference was given to vitamin A. The total number of estimations for vitamin E was, therefore, somewhat lower than for vitamin A.