Changes in plasma carotenoid and vitamin E profile during supplementation with oil palm fruit carotenoids

It has been hypothesized that supplementation with a single source of carotenoids causes perturbations in the plasma level of diet-derived carotenoids and that this may explain the lack of association between disease rates and the intake of carotenoid supplements. This article describes the effect of supplementation with an oil palm fruit extract, rich in beta- and alpha-carotene, on the plasma carotenoid profile of 15 healthy women volunteers. Volunteers were supplemented for 35 days with 15 mg/d of total carotenoids. Blood samples were taken at regular intervals during the supplementation period and analyzed for a range of carotenoids. Results indicate that the hydrocarbon carotenoid components of the supplement are absorbed and appear in the plasma disproportionately to the ratios in the supplement and that the plasma concentration of diet-derived lutein, a dihydroxy carotenoid ((3R,3'S,6'R)-beta,epsilon-carotene-3,3'-diol), is depressed, whereas that of lycopene is unaffected, Plasma alpha-tocopherol concentrations were unaffected by supplementation. It is concluded that supplementation with carotenoids from a single source results in plasma carotenoid profile changes that are not predictable from a knowledge of supplement composition and that such changes should be monitored and considered when drawing conclusions as to the effect of carotenoid supplementation on health outcomes.