Astaxanthin is a keto-carotenoid. It belongs to a larger class of chemical compounds known as terpenes built from five carbon precursors, isopentenyl diphosphate, and dimethylallyl diphosphate.
Lutein (/ˈljuːtiɪn, -tiːn/; 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.
The dried, ripe fruit and leaves are used to make medicine. Bilberry is used for improving eyesight, including night vision. … Some people use bilberry for conditions of the heart and blood vessels including hardening of the arteries (atherosclerosis), varicose veins, decreased blood flow in the veins, and chest pain.