People have always tried to stop the effects of time on the face. In France, one woman in two uses a day cream and 15 million use an anti-ageing beauty cream. If there is one sector that is not experiencing a crisis, it is that of anti-ageing creams. The market for this type of cosmetic product, which targets both women and men, is worth 10 billion euros per year. Highly competitive, highly secretive, this sector is constantly evolving.