Ramahdani, W., Iskandar, B. and Anggraini, D. 2026. Formulation and Evaluation of Sunscreen Cream Based on Titanium Dioxide and Zinc Oxide Nanopowders Combined with Niacinamide. KOLONI. 5, 3 (Sep. 2026), 4134–4144. DOI:https://doi.org/10.31004/koloni.v5i3.1303.