“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 3, no. 1 (February 27, 2026). Accessed April 14, 2026. https://proceedings.nuansafajarcemerlang.com/index.php/ico/article/view/178.