Mastering the formulation of an unstable vitamin C (VC) as anti‐aging skin care ingredient. Part I: A new approach. - Isoir‐Ingrez, Muriel; Falip, Anne; Yousfi, Naima; Arnaud‐Sebillotte, Laurence; Biatry, Bruno; Leroy, Florence; Wang, Pamella H.; Simonnet, Jean‐Thierry (International Journal of Cosmetic Science, 2025)