Jung, Eun Young, and Yang Hee Hong. “Oral Intake of Porcine Placental Extract Improves Skin Hydration and Wrinkles in a Double-Blind Placebo-Controlled Clinical Study: Porcine Placental Extract Improves Skin Hydration and Wrinkles”. Progress in Nutrition 25, no. 1 (March 21, 2023): e2023007. Accessed November 28, 2024. https://mattioli1885journals.com/index.php/progressinnutrition/article/view/12028.