Oppy aesaiw. (2019). 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(1), 26–31. https://doi.org/10.30994/sjp.v1i1.123