SCIMAT / SCIENCE PHOTO LIBRARY SCIMAT / SCIENCE PHOTO LIBRARY
Lutein is a xanthophyll and one many naturally-occurring carotenoids. It is present in green leafy vegetables such as kale and spinach as well as in egg yolks, animal fats, and the retina. In the retina, zeaxanthin predominates at the macula lutea whereas lutein predominates elsewhere in the retina. Lutein was traditionally used in chicken feed to provide the yellow colour of broiler chicken skin, this also resulted in a darker yellow egg yolk. Lutein is used in the body as an antioxidant and for blue light absorption. It has the molecular formula C40 H56 O2, and Molecular mass 568.87 g/mol. The large pills shown are 23 mm long. Image width: 42 mm. Magnification: 2.38x if the image is printed 10 cm wide. The soft gels are used as a food supplement for.
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