Hydroalcoholic products, which are an integral part of the barrier measures to combat the spread of the Covid-19 coronavirus, still raise many questions. What regulations do they depend on? What substances must (or must not) they contain? What claims can they make? Corinne Benoliel and Pauline Ferreira-Théret, from Institut Scientis, answer these questions (and many others), in this Q&A Biocide (and its cosmetic parallel) applied to hand antisepsis products.