Effect of Apocynum venetum Leaf Extract (VENETRON®) on Unidentified Complaints Relating Menstruation in Healthy Female Subjects-A Randomized, Double-blind, Placebo-controlled Parallel-group Comparison Study- 【2023】 Tomoko Kuniyoshi1), Yukiko Kobayashi1), Jinwei Yang1), Naoko Suzuki2), Tsuyoshi Takara3) TOKIWA PHYTOCHEMICAL CO., LTD. ORTHOMEDICO Inc. Medical Corporation Seishinkai, Takara Clinic. Jpn Pharmacol Ther 51(11), 1685-96 (2023)