Thursday, 18 March 2021

Q. Which one of the following is not a water soluble vitamin ?

... Answer is C). Retinol

Retinol is one of the most usable forms of Vitamin A. a fat-soluble vitamin and diterpenoid. Retinoids include the compounds retinoic acid, retinal (aldehyde) and retinyl ester. These compounds are available from plant and animal sources. Vitamin, A is essential for proper epithelial function, and available retinoic acid is procured by hyaluronic acid in the keratogenous zone to increase dermal moisture.

While retinol is insoluble in water, its bioavailábility in the dermal layers is hydrolyzed to retinoic acid, which is subsequently sequestered by hyaluronic acid- in the extracellular matrix to increase water content in cells. These mechanisms effect normal, hydrated dermal development.


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