2026. 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, 1 (Feb. 2026). DOI:https://doi.org/10.5281/2cjphb02.