This webinar in collaboration with JOB ON BEAUTY, provides an in-depth overview of the use of in vitro studies in the nutraceutical sector, highlighting their strategic role in both scientific and industrial development. After an introduction to the fundamental principles and the value of these experimental models, it will illustrate how in vitro studies contribute to understanding the biological behavior of nutraceutical ingredients. The focus will then shift to the main in vitro tests used to assess absorption, bioavailability, and biological efficacy, emphasizing how preclinical data can support informed R&D decisions and strengthen the scientific robustness of nutraceutical products.