In the world of cosmetics, evaluation makes it possible to ensure the safety and effectiveness of products and their ingredients. An area in which L'Oréal is a pioneer, in particular thanks to its expertise in the reconstruction of human skin for over 30 years. With reconstructed skin models, by reproducing the structure and by optimally imitating the conditions for application of products, it is possible to"predict" certain human physiological reactions. A fabulous tool on which a thousand formulas and hundreds of ingredients are tested every year, and which made it possible to stop testing finished products on animals since 1989 (14 years before it became a legal obligation). Today, the new center in Gerland, near Lyon, France, dedicated to predictive evaluation, produces 130,000 units of reconstructed tissue every year.