A vitamin has the same properties and specific chemical structure whether made in a laboratory or taken from plant or animal parts 一种维生素无论是来自实验室，还是取自植物或动物的某个部位，其特性和具体的化学结构是一样的。
A substance , such as a vitamin or mineral , that is essential in minute amounts for the proper growth and metabolism of a living organism 微量养料；微量营养元素一种对生物的正常生长和新陈代谢极其重要的微量物质，如一种维生素或矿物质
Micro nutrient : a substance , such as a vitamin or mineral , that is essential in minute amounts for the proper growth and metabolism of a living organism 微量养料：一种对生物的正常生长和新陈代谢极其重要的微量物质，如一种维生素或矿物质。
This is especially true of minority women , the researchers add , and public health programs should encourage them to take a vitamin supplement every day 研究人员补充说道，这对少数族裔妇女而言更是铁板钉钉的事实，公共卫生项目应鼓励她们每日服用维生素补充剂。
People who eat a variety of fruits , vegetables , whole grai , along with moderate amounts of a variety of low - fat dairy and protein and the right quantity of calories , probably don ' t need a vitamin su lement , she said 如果一个人每天食用多种水果、蔬菜、全麦，适量摄入低脂奶制品、蛋白质和卡路里，就不用再吃维生素片了。
People who eat a variety of fruits , vegetables , whole grains , along with moderate amounts of a variety of low - fat dairy and protein and the right quantity of calories , probably don ' t need a vitamin supplement , she said 如果一个人每天食用多种水果、蔬菜、全麦，适量摄入低脂奶制品、蛋白质和卡路里，就不用再吃维生素片了。
People might want to consider a vitamin supplement to raise their intake to 1000 ius per day , garland said , adding that it was well within the safety guidelines established by the national academy of sciences 因此，人们可以考虑服用补充剂将自己的维生素d摄入量提升至每天1000国际单位25微克。而这一摄入量也符合美国国家科学院制定的相关安全指导方针。
The red blood cells of a normal person , for instance , age and die in 120 days . new blood cells are formed in bone marrow cells to ensure normal functioning of the human body . however , a vitamin b12 deficiency can make the red blood cells dysfunctional or prevent their successful formation , which in turn causes megaloblastic anemia anemia in which abnormally sized red blood cells are found in the blood . in some cases , prolonged vitamin b12 deficiency can deter the formation and functioning of myelin , subsequently leading to neuritis inflammation of the nerves or incomplete brain development 例如，人类正常的红血球每120天便会老化死亡，所以骨髓细胞会持续产生新的红血球，以维持人类正常之身体功能，所以如果缺乏维他命b12 ，便容易造成红血球生合成功能不全，进而导致巨大型红血球贫血megaloblastic anemia又例如，因长期缺乏维他命b12 ，会造成神经髓鞘myelin生合成功能不全，进而导致神经炎及脑部发育不全等等。
