Oppy aesaiw. “Formulation and Determination of Sun Protection Factor (SPF) of Sunscreen Gel Preparations Containing Epigallocatechin Gallate (EGCG) Using the Spectrophotometric Method”. Strada Journal of Pharmacy 1, no. 1 (April 22, 2019): 26–31. Accessed October 16, 2025. https://www.thesjp.org/index.php/SJP/article/view/123.