1. Lee YK, Chung HH, Kang SB. Efficacy and safety of human placenta extract in alleviating climacteric symptoms: prospective, randomized, double-blind, placebo-controlled trial. J Obstet Gynaecol Res. 2009 Dec;35(6):1096-101.
2. Jung EY, Hong YH. 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. Progr Nutr [Internet]. 2023 Mar. 21 [cited 2024 Jan. 3];25(1):e2023007.
3. Lee JY, Lee C, Yoon SH, Choi H. Effect of porcine placental extract on menopausal symptoms in postmenopausal women: A prospective, randomized, double-blind, placebo-controlled trial. Taiwan J Obstet Gynecol. 2020 Sep;59(5):675-681.
4. Shen LH, Fan L, Zhang Y, Zhu YK, Zong XL, Peng GN, Cao SZ. Protective Effect and Mechanism of Placenta Extract on Liver. Nutrients. 2022 Nov 29;14(23):5071.