Our skin connects us to the world while also providing us with a boundary and a layer of protection. It's a biotope, an object of desire, and it allows us to smell the way we do. How can we keep our skin healthy, and heal it when it's unwell? On average, the skin is around two square meters in area and weighs between five and ten kilograms. For a long time, it was viewed primarily as a covering. But this multitalented organ is much more than that. It provides us with one of our senses, it can draw oxygen directly from the air, and it can even perceive sound waves and odor molecules. The skin is also a status symbol, with smooth, wrinkle-free skin symbolizing youth, beauty and success. Countless experts offer advice, including recommending anti-aging products containing acids, bases, enzymes, vitamins, or proteins. But only a few cosmetics are truly worth it, says dermatologist Professor Claudia Borelli of the University Hospital in Tübingen, Germany. The same goes for the advice of m