The word collagen is of Greek origin (kola = glue, and egonomen = produce), this compound word well expresses the purpose of collagen: it is a protein that 'glues together', 'unites' the parts of cells, promotes the formation and renewal of tissues. This very durable, fibrous protein (or protein) constitutes the largest portion of the human body's protein content, about 25% and of skin tissue it makes up 70%. Therefore, collagen is responsible for the elasticity and softness of the skin, it regenerates cells, builds joints, strengthens our bones, and together with vitamin C, it slows down the aging of the skin. However, as age progresses, its activity weakens, therefore it needs to be replenished. With the help of collagen, the skin becomes hydrated, more elastic, softer and firmer, discolorations fade, and scars and wrinkles caused by skin stretching become smoother.