1. The yellow pigment in the corpus luteum, in the yolk of eggs, or any lipochrome.
2. The dried powdered corpora lutea of the hog, formerly used as a progesterone source.
The information shown above for lutein is provided by Stedman's.
* Stedman's, part of Lippincott Williams & Wilkins, provide a comprehensive line of health-science publications for healthcare professionals and medical students.