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{{Short description|Substances animals can metabolize into vitamins}}<br />
A '''provitamin''' is a substance that may be converted within the body to a [[vitamin]]. The term '''previtamin''' is a synonym.<br />
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The term "provitamin" is used when it is desirable to label a substance with little or no vitamin activity, but which can be converted to an active form by normal [[metabolism|metabolic]] processes.<br />
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==Example==<br />
Some provitamins are:<br />
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* "Provitamin A" is a name for [[Beta-Carotene|β-carotene]], which has only about 1/6 the [[biological activity]] of [[retinol]] ([[vitamin A]]); the body uses an [[enzyme]] to convert β-carotene to retinol. In other contexts, both β-carotene and retinol are simply considered to be different forms ([[vitamer]]s) of vitamin A.<br />
* "Provitamin B5" is a name for [[panthenol]], which may be converted in the body to vitamin B<sub>5</sub> ([[pantothenic acid]]).<br />
* [[Menadione]] is a synthetic provitamin of [[vitamin K]].<br />
* Provitamin [[vitamin D|D<sub>2</sub>]] is [[ergosterol]], and provitamin D<sub>3</sub> is [[7-dehydrocholesterol]]. They are converted by UV light into vitamin D. The human body produces provitamin D<sub>3</sub> naturally; deficiency is usually caused by a lack of sun exposure, not a lack of the provitamin.<br />
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==External links==<br />
*[https://deerforia.com/ Vitamin Gummies]<br />
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{{二次利用|date=5 December 2023}}<br />
[[Category:Vitamins]]</div>FuzzyBot