Glycerin

グリセリン

Hydrating (保湿) cosmetic strong evidence

What It Does

One of the most effective and well studied humectants. Draws water into the skin and helps other ingredients absorb better.

Glycerin is one of the most effective and widely used humectants in skincare. It is a simple, three-carbon alcohol that attracts water from the environment and deeper skin layers, binding it to the skin surface. Glycerin is found naturally in skin as part of the natural moisturizing factors and is universally compatible with all skin types.

Glycerin is beloved in formulations because it is effective, inexpensive, stable, and non-irritating. It improves skin barrier function, accelerates wound healing, and can even provide some antimicrobial benefits. At concentrations above 20%, it can also act as a preservative.

In Japanese skincare, glycerin is a foundational ingredient found in nearly every moisturizing product. It is especially prominent in toners and essences where it provides lightweight hydration without heaviness. Japanese formulations often combine glycerin with other humectants like hyaluronic acid for layered hydration.

How It Works

Attracts water to skin surface and binds it, preventing evaporation. Supports barrier function and accelerates healing.