Dietary antioxidants

nutrient found in citrus fruits and other foods

Lutein (; from Latin luteus meaning "yellow") is a xanthophyll and one of 600 known naturally occurring carotenoids. Lutein is synthesized only by plants, and like other xanthophylls is found in high quantities in green leafy vegetables such as spinach, kale and yellow carrots. In green plants, xanthophylls act to modulate light energy and serve as non-photochemical quenching agents to deal with triplet chlorophyll, an excited form of chlorophyll which is overproduced at high light levels during photosynthesis.

An iodide ion is I−. Compounds with iodine in formal oxidation state −1 are called iodides. In everyday life, iodide is most commonly encountered as a component of iodized salt, which many governments mandate. Worldwide, iodine deficiency affects two billion people and is the leading preventable cause of intellectual disability.

group of chemical compounds

Allicin is an organosulfur compound obtained from garlic and leeks. When fresh garlic is chopped or crushed, the enzyme alliinase converts alliin into allicin, which is responsible for the aroma of fresh garlic. Allicin is unstable and quickly changes into a series of other sulfur-containing compounds such as diallyl disulfide. Allicin is an antifeedant, i.e. the defense mechanism against attacks by pests on the garlic plant.

Tocopherols (; TCP) are a class of organic compounds comprising various methylated phenols, many of which have vitamin E activity. Because the vitamin activity was first identified in 1936 from a dietary fertility factor in rats, it was named tocopherol, from Greek and , that is 'to carry a pregnancy', with the ending -ol signifying its status as a chemical alcohol.

thumb|Red, blue, and purple colors of berries derive mainly from polyphenol phytochemicals called [[anthocyanins.]] thumb|Cucurbita fruits, including squash and [[pumpkin, typically have high content of the phytochemical pigments called carotenoids.]]

Crocin is a carotenoid chemical compound that is found in the flowers of crocus and gardenia. Crocin is the chemical primarily responsible for the color of saffron.

Mangostin is a natural xanthonoid, a type of organic compound isolated from various parts of the mangosteen tree (Garcinia mangostana). It is a yellow crystalline solid with a xanthone core structure.