Collagen is the most abundant and most important protein produced by the body for the skin. It accounts for one-third of our body's total protein content and, in addition to skin, keeps teeth, bones, muscles, joints and all connective tissues strong and healthy. What is more, collagen is responsible for 60% of all factors that regulate the moisture content of the skin. This protein is therefore crucial in maintaining the functionality, elasticity and firmness of the skin. It literally is the glue that holds the body together. The problem is that the body's production of collagen declines as we age, which can lead to sagging, wrinkled skin. The good news is that you can get to the root of the problem and correct this deficiency fairly quickly with a collagen-containing skincare regimen. In fact, this can even minimize existing signs of aging and greatly mitigate future negative changes. This is because collagen can penetrate the epidermis from the outside, sustainably moisturising it and restoring the skin's elasticity – provided it is skin-identical collagen. One that has a comparable molecular structure to the body's own collagen and can therefore be absorbed particularly well by the skin. This collagen is found exclusively in the skin, intestines and bone marrow of animals. There is nothing to sugarcoat here – none of the other collagens can effectively counteract the causes of skin aging. This is important to know about collagen and skincare.