FORMULATION AND PHYSICAL STABILITY TESTING OF A FACIAL SERUM GEL CONTAINING GOTU COLA (Centella asitica (L.)) LEAF EXTRACT WITH VARIYING OF CARBOMER CONCENTRATIONS AS A GELLING AGENT. Proceedings OPTIMAL, [S. l.], v. 3, n. 1, 2026. DOI: 10.5281/2cjphb02. Disponível em: https://proceedings.nuansafajarcemerlang.com/index.php/ico/article/view/178. Acesso em: 14 apr. 2026.