One of the most commonly added vitamins to milk is Vitamin D, as it is not naturally found in milk. This essential nutrient plays a crucial role in maintaining strong bones and teeth, as well as supporting overall immune health. Vitamin D is produced in the body when the skin is exposed to sunlight, but many people do not get enough sun exposure to meet their daily requirements. Therefore, adding Vitamin D to milk is a convenient way to ensure that people are getting an adequate amount of this vital nutrient. In addition to its role in bone health, Vitamin D has also been linked to a reduced risk of chronic diseases such as heart disease, diabetes, and certain types of cancer. It is important to note that Vitamin D is a fat-soluble vitamin, meaning that it is best absorbed when consumed with a source of fat. This is why milk, which naturally contains fat, is an ideal vehicle for fortification with Vitamin D. For those who are lactose intolerant or choose not to consume dairy products, there are other sources of Vitamin D available. Fatty fish such as salmon and mackerel, egg yolks, and fortified foods like orange juice and cereal are all good sources of Vitamin D. However, milk remains one of the most popular and easily accessible sources of this important nutrient. In conclusion, Vitamin D is the most commonly added vitamin to milk because it is not naturally found in milk and plays a crucial role in maintaining overall health. By fortifying milk with Vitamin D, manufacturers are able to provide consumers with a convenient and effective way to meet their daily requirements for this essential nutrient. To learn more about the benefits of Vitamin D and its role in maintaining optimal health, visit [www.healthline.com/nutrition/vitamin-d-benefits](www.healthline.com/nutrition/vitamin-d-benefits) or [www.mayoclinic.org/drugs-supplements-vitamin-d/art-20363792](www.mayoclinic.org/drugs-supplements-vitamin-d/art-20363792).

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