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vitamin D

noun

  1. any of the several fat-soluble, antirachitic vitamins D 1 , D 2 , D 3 , occurring in milk and fish-liver oils, especially cod and halibut, or obtained by irradiating provitamin D with ultraviolet light, essential for the formation of normal bones and teeth.


vitamin D

noun

  1. any of the fat-soluble vitamins, including calciferol and cholecalciferol, occurring in fish-liver oils (esp cod-liver oil), milk, butter, and eggs: used in the treatment of rickets and osteomalacia


vitamin D

  1. Any of a group of fat-soluble sterols necessary for normal bone growth, especially vitamin D 2 ( ergocalciferol ) and vitamin D 3 ( cholecalciferol ). Vitamin D is found in milk, fish, and eggs and can be produced in the skin on exposure to sunlight. A deficiency of vitamin D in the diet causes rickets in children.


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Word History and Origins

Origin of vitamin D1

First recorded in 1920–25

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Example Sentences

Despite its bad reputation, cholesterol is important, as from cholesterol the body produces steroid hormones like cortisol and testosterone or makes vitamin D in the skin.

If going from the already-high level of 86 to 100 gives you a benefit, that makes vitamin D sound like a more-is-better performance-booster as opposed to something you just need to get enough of, like food and water.

For comparison, the current recommended daily allowance of vitamin D is 600 IU for adults, or 4,200 IU per week.

The case for vitamin D as a sports performance booster got a minor bump from a couple of recent studies.

There have been a bunch of meta-analyses aggregating the results of vitamin D studies in athletes—but still no consensus.

I take calcium and vitamin D supplements, but prescription medications are generally only for women in menopause.

The irony in it all is that our bodies need, if not crave, Vitamin D—and more than a chewable tablet.

Spring is starting to arrive, and we plan to soak up as much sun as our vitamin-D-deficient bodies can handle.

Vitamin D3—Most of you reading this are probably vitamin D deficient if you wear clothes and work indoors.

One more thing, take it in the morning otherwise it can disrupt your sleep since vitamin D and melatonin are inversely related.

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vitamin Cvitamin D1