From Longman Dictionary of Contemporary Englishcollagencol‧la‧gen /ˈkɒlədʒən $ ˈkɑː-/ noun [uncountable] DCBHCCa protein found in people and animals. It is often used in beauty products and treatments to make people look younger and more attractive.
Examples from the Corpus
collagen• Similar effects are seen when a collagen gel sandwich is used to culture hepatocytes.• The paste contains collagen suspended in a salt solution mixed with a local anaesthetic, lignocaine.• Electron microscopy showed a striking increase in collagen with minimal fibroblast proliferation.• Such myofibroblast type cells were focally surrounded by mature collagen fibres.• So no collagen and therefore no skeleton; no muscle and consequently no movement.• Ideal One of its scientists working on the suture project discovered a special type of collagen which made an ideal sausage casing.• There was an article on collagen injections lying in front of her.• Sunlight penetrates the layers of skin, damaging the collagen and elastic fibres.Origin collagen (1800-1900) French collagène, from Greek kolla ( → COLLAGE) + French -gène “producing” 