Risa Ahdyani, R. Patimah, E. Fatmasari, S. Rahayu, and R. Annisa, “Influence of Hydroxyethyl Cellulose and Glycerin Concentration Variations on the Physicochemical Stability of Niacinamide- Loaded Nanoparticle Serum Formulations”, ad-dawaa.j.pharm.sci, vol. 8, no. 2, pp. 221–234, Dec. 2025.