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<p><b>New page</b></p><div>[[File:Vitamin A2.svg|thumb|{{PAGENAME}}]] <br>'''Vitamin A2''', also known as '''3,4-didehydroretinol''', is one of the forms of [[vitamin A]], which is essential for many biological processes. It is less common than [[Vitamin A1|retinol]], but is found in certain freshwater fish species and is believed to have similar biological activity.<br />
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== Structure and Properties ==<br />
Vitamin A2 is a [[diterpenoid]] and is characterized by a 20-carbon structure, which is assembled from a four carbon unit. It is a [[polyene]] compound, meaning it contains multiple [[double bond]]s. The molecule has a cyclic end group, a polyene side chain, and a [[hydroxyl]] group. The presence of the double bonds allows for the absorption of light, which is critical for the vitamin's role in vision.<br />
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== Biological Role ==<br />
Like other forms of vitamin A, Vitamin A2 plays a crucial role in maintaining healthy [[vision]], [[growth]], and [[tissue differentiation]]. It is a component of the [[rhodopsin]] molecule, which is activated when light shines on the [[retina]], signaling the brain about light changes in the environment. <br />
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Vitamin A2 also supports the health of the [[skin]] and [[mucous membrane]]s, the [[immune system]], and [[bone growth]]. Deficiency in vitamin A2 can lead to a series of health problems, including [[night blindness]], [[hyperkeratosis]], and increased susceptibility to infections.<br />
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== Dietary Sources and Supplementation ==<br />
Vitamin A2 is found in certain freshwater fish species, such as the [[rainbow trout]]. However, it is less common in the human diet compared to retinol. <br />
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Supplementation with Vitamin A2 is not common, as the body can convert dietary sources of other forms of vitamin A into the necessary retinoids. However, in cases of deficiency or certain health conditions, supplementation may be recommended under the guidance of a healthcare professional.<br />
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== See Also ==<br />
* [[Vitamin A]]<br />
* [[Retinol]]<br />
* [[Rhodopsin]]<br />
* [[Vitamin deficiency]]<br />
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[[Category:Vitamins]]<br />
[[Category:Nutrition]]<br />
[[Category:Biochemistry]]<br />
{{Vitamins}}<br />
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