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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Supplements: To reduce your risk of osteoporosis, your healthcare provider may recommend taking calcium and vitamin D supplements.9
Early menopause happens between ages 40 and 45, and risk factors include family history, smoking, certain cancer treatments, and chronic conditions.
—
Carrie Madormo, Verywell Health, 12 Aug. 2025
In those cases, a combination of protein, calcium, and vitamin D can support bone health.
—Boutayna Chokrane, Wired News, 6 Aug. 2025
From St John’s wort to vitamin D, the range of over-the-counter supplements for mental health support and wellbeing continues to expand at a rate faster than scientists can validate their efficacy.
—New Atlas, 14 July 2025
Discuss with your healthcare provider whether to avoid taking a vitamin D supplement while taking cod liver oil.
—Hannah Coakley, Verywell Health, 5 Aug. 2025
See All Example Sentences for vitamin D
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Carrie Madormo, Verywell Health, 12 Aug. 2025
In those cases, a combination of protein, calcium, and vitamin D can support bone health.
—Boutayna Chokrane, Wired News, 6 Aug. 2025
From St John’s wort to vitamin D, the range of over-the-counter supplements for mental health support and wellbeing continues to expand at a rate faster than scientists can validate their efficacy.
—New Atlas, 14 July 2025
Discuss with your healthcare provider whether to avoid taking a vitamin D supplement while taking cod liver oil.
—Hannah Coakley, Verywell Health, 5 Aug. 2025
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 22 Aug. 2025.
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