Plant glycerin, the most studied moisturising ingredient
By Jeremy Fain, founder of Restelys. Updated 17 October 2026. 2 sources cited.
Discreet on labels, glycerin is nevertheless the moisturising ingredient that dermatology research knows best.
Glycerin occurs naturally in our skin, where it helps hold on to water. The glycerin we require is plant-derived, made from rapeseed oil, preferably European, and free of palm oil.
Its role is simple and well measured: it attracts water and keeps it in the upper layers of the skin. Studies show that it improves hydration, supports the barrier function and makes the skin more supple, including in rinse-off products.
It has another merit: it lets us formulate gentle care without synthetic moisturising agents. It is a base ingredient of our whole range, from the hand soap to the body lotion.
Sources
- Fluhr J.W., Darlenski R., Surber C. “Glycerol and the skin: holistic approach to its origin and functions”. British Journal of Dermatology, 2008.
- Lodén M. “Role of topical emollients and moisturizers in the treatment of dry skin barrier disorders”. American Journal of Clinical Dermatology, 2003.
The studies cited concern the ingredient or the skin, not our finished products.
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