Collagen is a glycoprotein, a fibrillar protein that forms the basis of the body’s connective tissue (tendon, bone, cartilage, dermis, fascia, etc.) its strength and elasticity. Collagen is found in animals; it is absent in plants, bacteria, viruses, protozoa, and fungi. Collagen is the main component of connective tissue and the most common protein in mammals, making up 25% to 45% of proteins in the entire body. Collagen synthesis is very energy-intensive and occurs only in animals that use oxygen