vitamin D
noun
: any or all of several fat-soluble vitamins chemically related to steroids, essential for normal bone and tooth structure, and found especially in fish-liver oils, egg yolk, and milk or produced by activation (as by ultraviolet irradiation) of sterols: such as
a
or vitamin D2
: calciferol
b
or vitamin D3
: cholecalciferol
Examples of vitamin D in a Sentence
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Key Takeaways Too much vitamin D can lead to harmful health effects, including high calcium in the blood.
—
Jamie Johnson, Verywell Health, 29 Jan. 2026
Diet, exercise, and other lifestyle changes are more effective for preventing type 2 diabetes than vitamin D alone, experts say.
—Currie Engel, Health, 29 Jan. 2026
Protein, iron, vitamin D, and omega-3s are all essential nutrients to focus on.
—wendy Wisner, Parents, 29 Jan. 2026
Few have much evidence behind them, but two that Jooste and his colleagues highlight are vitamin D and probiotics.
—Outside, 28 Jan. 2026
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Jamie Johnson, Verywell Health, 29 Jan. 2026
Diet, exercise, and other lifestyle changes are more effective for preventing type 2 diabetes than vitamin D alone, experts say.
—Currie Engel, Health, 29 Jan. 2026
Protein, iron, vitamin D, and omega-3s are all essential nutrients to focus on.
—wendy Wisner, Parents, 29 Jan. 2026
Few have much evidence behind them, but two that Jooste and his colleagues highlight are vitamin D and probiotics.
—Outside, 28 Jan. 2026
See All Example Sentences for vitamin D
Cite this Entry
“Vitamin D.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vitamin%20D. Accessed 1 Feb. 2026.
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