Glycerin

What it is

Glycerin (glycerol) is a small humectant molecule that draws water into the outer layer of the skin and helps hold it there. By increasing stratum corneum hydration it supports a smoother surface and a better-functioning skin barrier. It is one of the most widely used moisturizing ingredients in cosmetic formulations.

Benefits

Improves skin hydration and reduces transepidermal water loss; formulations using roughly 5% have produced measurable hydration gains, and a 20% glycerol cream improved barrier function versus placebo in atopic skin.

When to take it

Suitable AM and PM. Apply to slightly damp skin and seal with a moisturizer or occlusive to lock in water; layers well under other actives and under sunscreen.

Side effects

Very well tolerated; high concentrations can feel sticky or tacky and may transiently draw moisture from skin in very dry, low-humidity air if not paired with an occlusive. Irritation and allergy are rare.

Sources

• Moisture retention of glycerin solutions with various concentrations: a comparative study
• 24-hour skin hydration and barrier effects of a hyaluronic 1%, glycerin 5% moisturizing fluid (randomized study)

Products containing Glycerin

No products in our database contain this ingredient yet.