Biomarker Role. In 2016 researchers identified lutein as one of the carotenoids that makes an excellent biomarker in observing women's dietary intake. In other words, the levels of lutein in the blood indicate the degree to which nutrients are actually being absorbed by the body and being used by cell tissue.11 Generally, biomarkers are used as tools in diagnosing disease.
Atherosclerosis. Lutein may also be helpful in fighting atherosclerosis by improving circulation. Researchers found that lutein levels in the blood are tied to artery wall thicknessand may help to reduce accumulation of plaque by preventing oxidation of fats in the bloodstream.