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Vitamin Studies in Middle-Aged and Old Individuals

I. The Vitamin A, Total Carotene and + ß Carotene Concentrations in Plasma¹

One Figure

Division of Gerontology, Washington University School of Medicine and the St. Louis City Infirmary Hospital, St. Louis, Missouri

An investigation was made of the concentrations of plasma vitamin A, total carotene and + ß carotene in 155 middle-aged and old individuals offered a diet adequate in vitamin A, and in 47 younger subjects. The individual values observed varied greatly, but no statistically significant differences were found between the calculated means of the various age groups. The average concentrations of vitamin A, total carotenes, and + ß carotenes in plasma were 17–23, 200–320, and 100–190 µg%, respectively. No certain difference was found between the male and female subjects studied.

Manuscript received 24 February 1948.