久久91导航_成人做爰视频_91福利视频在线观看_www.九色.com_91视频黄污_成人三级黄色片

ppearance: yellow crystalline powder
Function: folic acid, also known as vitamin B9, is a wa-ter-soluble vitamin, which can promote the matura-tion of immature cells in bone marrow.Lack of folicacid in human can cause megaloblastic anemia andleukopenia, which is especially important for preg-nant women.