Inositol is a major component of lecithin that may have water-binding properties for skin. It is not a vitamin, although it is sometimes mistakenly thought of as a B vitamin.

References for this information:

Journal of the Society of Cosmetic Scientists of Korea, December 2020, Volume 45, Issue 4
International Federation of Societies of Cosmetic Chemists, November 2020, Volume 23, Number 3
Frontiers in Pharmacology, October 2019, ePublication
Comparative Medicine, February 2011, pages 39–44

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