Carotenoids are the most widespread pigments in nature. One or more carotenoids in combination give rise to colours ranging from yellow to red in birds, fishes, crustaceans, micro-organisms, fruits and plants, including the dark green ones. There are over 600 known carotenoids and they are divided into two classes: xanthophylls, which contain oxygen, and carotenes, which are purely hydrocarbons and contain no oxygen. Carotenoids have many health benefits including antioxidant properties, free-radical scavengers, decreasing the risk of cardiovascular disease, anti-inflammatory properties, osteoporosis prevention and other diseases. The 15 chapters in this book have been written to outline recent topical research.