Graydon, R, Hogg, R E, Chakravarthy, U, Young, I S & Woodside, J V 2012, ' The effect of lutein-and zeaxanthin-rich foods v. supplements on macular pigment level and serological markers of endothelial activation inflammation and oxidation pilot studies in healthy volunteers : pilot studies in healthy volunteers ' British Journal of Nutrition, vol. 108, no. 2, pp. 334-42 . DOI: 10.1017/S0007114511005599