Abstract
Changes in vitamin A and carotene levels in two human subjects after administering solubilized vitamin A and β-carotene were followed and it was found that the solubilized vitamin A appeared more and sooner in serum than the vitamin in oil, i.e., a maximum level of the former was reached in 1-2 hours, whereas that of the latter in 3-5 hours, the highest rise in the level of the former being about 1.5 times that of the latter. In the case of β-carotene, the highest carotene level in serum was reached in both cases in 5-6 hours, and that of vitamin A in 3-4 hours without any difference between the two.
