Translations:Provitamin/4/en: Difference between revisions

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Message definition (Provitamin)
* "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.
* "Provitamin B5" is a name for [[panthenol]], which may be converted in the body to vitamin B<sub>5</sub> ([[pantothenic acid]]).
* [[Menadione]] is a synthetic provitamin of [[vitamin K]].
* 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.
  • "Provitamin A" is a name for 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 (vitamers) of vitamin A.
  • "Provitamin B5" is a name for panthenol, which may be converted in the body to vitamin B5 (pantothenic acid).
  • Menadione is a synthetic provitamin of vitamin K.
  • Provitamin D2 is ergosterol, and provitamin D3 is 7-dehydrocholesterol. They are converted by UV light into vitamin D. The human body produces provitamin D3 naturally; deficiency is usually caused by a lack of sun exposure, not a lack of the provitamin.
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