Glycerin is a trihydric alcohol and thus plays a crucial role in the hydration of the stratum corneum: if the barrier function is impaired, changes in the function of aquaporin 3, an epidermal water/glycerin transporter, can occur, which can lead to reduced hydration and loss of elasticity in the skin. This can be corrected by topical application of glycerin.(1)
(1) Giménez-Arnau, A. (2016). Standards for the Protection of Skin Barrier Function. Current Problems in Dermatology, 49, 123–134. https://doi.org/10.1159/000441588
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