Ariyanti A, Masruriati E, Nurhidayah N, Widiyana A. Optimization of Placuna Placenta Collagen Serum on Adolescent Skin. IJGHR [Internet]. 27Jun.2021 [cited 21Sep.2026];3(2):237-44. Available from: http://jurnal.globalhealthsciencegroup.com/index.php/IJGHR/article/view/487