Lutein: A Comprehensive Review on its Chemical, Biological Activities and Therapeutic Potentials, Fuad, Nurul Iman Nurul, Sekar Mahendran, Gan Siew Hua, Lum Pei Teng, Vaijanathappa Jaishree, and Ravi Subban , Pharmacognosy Journal, November 2020, Volume 12, Issue 6s, p.1769-1778, (2020)