Lutein and lycopene has chemopreventive activity, the possible mechanism is their antioxidant effects. Nutritional supplementation with lutein or lutein together with antioxidants, vitamins, and minerals, improves visual function and symptoms in atrophic age-related macular degeneration (ARMD). Lutein is a carotenol. It has a role as a plant metabolite and a food colouring. It derives from a hydride of a (6'R)-beta,epsilon-carotene.

1-Deoxynojirimycin is an optically active form of 2-(hydroxymethyl)piperidine-3,4,5-triol having 2R,3R,4R,5S-configuration. It has a role as a hypoglycemic agent, a hepatoprotective agent, an anti-HIV agent, an EC 3.2.1.20 (alpha-glucosidase) inhibitor, an anti-obesity agent, a plant metabolite and a bacterial metabolite. It is a piperidine alkaloid and a 2-(hydroxymethyl)piperidine-3,4,5-triol. 1-Deoxynojirimycin is a potent α-glucosidase inhibitor, suppresses postprandial blood glucose, thereby possibly preventing diabetes mellitus. 1-Deoxynojirimycin as a therapeutic agent by controlling the overgrowth and biofilm formation of S. mutans, it also can block human immunodeficiency virus envelope glycoprotein- mediated membrane fusion at the CXCR4 binding step. 1-Deoxynojirimycin is an orally effective alpha glucosidase inhibitor. 1-Deoxynojirimycin inhibits postprandial blood glucose and prevents diabetes. 1-Deoxynojirimycin has hypoglycemic, weight loss, and antiviral effects.