High levels of lipids such as cholesterol and triglycerides may prolong the amount of time it takes for vitamin E to be absorbed from the bloodstream, according to research appearing in the American Journal of Clinical Nutrition.
In the study, 41 men and women (included both younger and older adults) were fed deuterium-labeled collard greens as a source of vitamin E that could be tracked as it moved through the body. While there was no significant difference in vitamin E absorption based on age or gender, elevated lipids in blood plasma was associated with vitamin E lingering in the blood stream rather than reaching body tissues.
Using a stable isotope methodology, the authors determined that only 24% of vitamin E is actually absorbed into the body vs. previous estimates of 81% via the measurement of radioactive vitamin E. Because of these absorption issues, the researchers support the recommended daily allowance of 15mg daily of vitamin E despite others suggesting that this amount should be reduced.
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