Siregar, Citra Sari Dewi, Julia Reveny, and Aminah Dalimunthe. “Formulation and Clinical Evaluation of Anti-Aging Activity of Blemish Balm Cream Vitamin E and Determination of SPF Value With Spectrophotometry”. Asian Journal of Pharmaceutical Research and Development 7, no. 6 (December 15, 2019): 35–42. Accessed March 28, 2024. https://ajprd.com/index.php/journal/article/view/623.