Jan 10, 2022 · Vitamin D3 is made by your own body when you are exposed to adequate amounts of sunlight. It is also found in some foods, including eggs, mushrooms, and fish, such as salmon, tuna, and mackerel. (2) Vitamin D3 is changed into a form of Vitamin D called 25 hydroxyvitamin D, also known as 25 (OH)D. A vitamin D blood test measures the level of 25
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