Glycerin for skin: why dermatologists swear by the super hydrator

If there’s one skincare ingredient that’s stood the test of time, it’s glycerin. In fact, using glycerin for skin health dates back to the late 18th century, when it was used in hygiene products and general cleaning. As it grew in popularity, it began to be incorporated into skincare products like toners and other topical formulas.

Now, it’s a quiet skincare behemoth, appearing in the INCI lists of cleansers, mists, essences, serums, body washes and moisturisers. Why is glycerin in such demand, though? We asked three leading dermatologists to explain.

What is glycerin?

“Glycerin, also known as glycerol, is a naturally occurring compound found in both animal and plant fats,” explains Dr Sophie Momen, consultant dermatologist at The Cadogan Clinic. Though she goes on to say, most cosmetic-grade glycerin is plant-derived. “Glycerin is a colourless, odourless, syrupy liquid that’s been used in skincare for centuries due to its ability to retain moisture.”

Molecularly speaking, glycerin has an innate ability to bind with water, which is what makes it such a powerful hydrator for the skin. Often, it’ll be listed as “glycerin, glycerin or glycerine” on skincare labels, Momen finishes.

Is glycerin a humectant?

Yes, glycerin is a humectant and one of the most effective and efficient ones, at that. “A humectant works by attracting water molecules, either from the deeper layers of your skin or from the environment, and binding them to the skin’s surface. This function is crucial in helping the skin stay hydrated, plump and smooth,” Momen explains.

An easy way to understand the role of a humectant is to think of it as a magnet for water. Glycerin, for example, pulls water towards it, holding it within the skin barrier and preventing it from escaping. “This makes glycerin especially important in maintaining skin elasticity, preventing dryness and supporting the skin’s natural healing processes,” she says.

What are the benefits of using glycerin?

At a glance, glycerin can:

• “Deliver deep hydration by attracting and binding moisture to the skin, keeping it soft and supple,” says Momen.
• Improve elasticity and appear firmer and more resilient.
• Can smooth rough or bumpy textures.
• Alleviate dry patches.
• Promote enhanced healing and support faster repair.