lutein and its Impurities

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. It is an xanthophyll and one of 600 known naturally occurring carotenoids. Reference standards of Lutein API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.