One of the remarkable ingredients of the food industry is hydrolyzed collagen which contains 8 out of 9 essential amino-acids and glycine, and the proline concentration is nearly 20 times higher than other protein-rich foodstuffs (Anon, 2009). In humans and animals, 25% of their body protein is in the form of collagen. Due to the decrease of collagen synthesis in the body, its demand for the skin, hair, and bone tissues increases with ageing (Iwai et al., 2005).