食物中的維生素D可分為兩種，存在菇類或酵母中的維生素，稱之為麥角固醇，存在動物性食物中的稱之為7-去氫膽固醇，經過日光照射後，前者轉變成維生素D2，後者則轉變成為生物D3。一般含維生素D較多的有魚肝油、肝臟、蛋黃和牛奶，人體食入後，會移到皮膚，經日光照射後產生維生素D3。

美國早在1930年就在牛奶中添加維生素D3，而市面上所賣的鈣片，也大半添加維生素D3。維生素D有幫助鈣質吸收，因此有強健骨骼的作用，牛奶中本身就富含鈣質，因此添加維生素D3，有加成吸收鈣質的作用。含有維他命D3的食物:魚類缺乏症:佝僂病攝取過量之症狀:高血壓,心律不整,噁心,體重減,抽搐,腹痛,食慾不振,精神和身體成長受阻,動脈提早硬化以及腎臟損壞.

現在市面上有一種 天然珠貝鈣Ca+D3效果：【鈣】構成牙齒與骨骼的主要成分。維持心臟、肌肉正常收縮及神經的感應性。活化凝血酶元轉變為凝血酶，幫助血液凝固。控制細胞的通透性。維持骨骼及牙齒的健康。【維他命Ｄ３】幫助或促進鈣、磷的吸收及利用。幫助骨骼及牙齒的生長發育。幫助維持血鈣的正常濃度。維持神經、肌肉生理的正常。幫助骨骼鈣化(calcification)。運動量少或不喜歡戶外活動者尤其應該補充。

Nature Made Vitamin D 2000 IU Softgels, 250-count Maintaining healthy levels of vitamin D in your body has been shown to be an important part of your overall health. Nature Made Vitamin D 2000 IU softgels are made with vitamin D3, the body’s preferred form of vitamin D. Vitamin D supports bone, teeth, muscle and immune health.† Helps Maintain Healthy Vitamin D Levels Depending on your status and other related factors, 1000 – 5000 IU per day of vitamin D is a commonly recommended dose range by health care professionals and supported by research. Higher levels may be recommended in a deficiency state.† Supports Strong Bones and Teeth† Vitamin D helps build and maintain strong bones and teeth by enhancing calcium absorption, regulating concentrations of calcium and phosphorus in the body, and regulating bone remodeling processes. Adequate calcium and vitamin D throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis. Nature Made Vitamin D is an easy way to get adequate amounts of this vital nutrient.† Supports Muscle Health† Vitamin D is also important for muscle health because it supports muscle function, strength and balance.† Supports a Healthy Immune System† Research demonstrates that vitamin D supports immune health, playing a crucial role in both acquired and innate immune responses.†

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