Collagen is an important component of the intercellular substance of animal organisms and one of the main building proteins of the body. It is a natural polymer, which accounts for about 30% of all proteins that make up the human body - it occurs in the skin, muscles or cornea of the eye, and what is more, it is one of the main components of connective tissue.

The level of collagen in the body decreases with age as a result of natural aging processes taking place in the body. However, protein can be obtained from animal bones or tendons. The compound used in OstroVit Collagen Kissel is marine collagen type I, also called fish collagen, which in terms of structure is similar to collagen formed naturally in the human body and is considered one of the most effective types of compound.