Ramahdani W, Iskandar B, Anggraini D. Formulation and Evaluation of Sunscreen Cream Based on Titanium Dioxide and Zinc Oxide Nanopowders Combined with Niacinamide. KOLONI [Internet]. 2026 Sep. 30 [cited 2026 Oct. 2];5(3):4134-4. Available from: https://koloni.or.id/index.php/koloni/article/view/1303