Siregar, Citra Sari Dewi, Julia Reveny, and Aminah Dalimunthe. 2019. “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 (6):35-42. https://doi.org/10.22270/ajprd.v7i6.623.