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Glycerin

Glycerol

Well toleratedHumectanthumectantsolventskin conditioning

No meaningful concern for most people; irritation is possible but rare.

Also written as: Glycerol · Glycerine · 1,2,3-Propanetriol

What it is

Glycerin is a small, water-loving alcohol found naturally in the skin's own moisturising system and in all plant and animal fats. Cosmetic grades are usually made from vegetable oils such as rapeseed, soy or palm, or produced by fermentation. Formulators use it because it is cheap, extremely well tolerated, and one of the few humectants with strong clinical evidence behind it.

What it does well

  • Measurably increases hydration in the outer skin layer

    Glycerin binds water in the stratum corneum and slows its loss. Instrument-based studies consistently show higher skin hydration and lower water loss after use, and the effect builds over repeated application rather than fading.

    Strong evidence

  • Helps repair a damaged skin barrier

    In a placebo-controlled trial in people with atopic dermatitis, a glycerol-based emollient improved both hydration and barrier recovery on eczematous skin. Glycerin also appears to help the skin's natural desquamation enzymes work properly, which reduces flaking.

    Strong evidence

  • Suits essentially every skin type, including sensitive and acne-prone

    Glycerin is non-comedogenic, fragrance-free by nature, and among the least allergenic cosmetic ingredients in existence. Allergic reactions are documented but vanishingly rare.

    Strong evidence

Worth knowing

  • The claim that glycerin "pulls water out of your skin" in dry air is largely unfounded at cosmetic levels

    This popular internet warning comes from experiments with near-pure glycerin in very low humidity. At the concentrations actually used in face masks and creams (typically 2 to 10%, in a water-based formula), the evidence shows net hydration gain, not loss. There is no good reason to avoid glycerin in winter.

    Matters most toNobody in practice; this is a myth worth setting aside.

  • Can feel sticky or tacky at high concentrations

    This is a texture issue rather than a safety one. Products built around very high glycerin levels can leave a slightly sticky film, which some people dislike under makeup.

    Matters most toPeople who prefer a dry, matte finish.

Where the EU stands

No specific restriction

Permitted in EU cosmetics with no concentration limit. It is not listed in the banned, restricted or preservative annexes of the Cosmetics Regulation.

Sources (2)

Every link goes to the original: a journal, a PubMed record or an EU document.

  1. [1]
    Glycerol and the skin: holistic approach to its origin and functions

    British Journal of Dermatology · 2008 · doi:10.1111/j.1365-2133.2008.08643.x

    A review concluding that topical glycerol improves skin properties in conditions marked by dryness and impaired barrier function, including atopic dermatitis.

  2. [2]
    Placebo-controlled, double-blind, randomized, prospective study of a glycerol-based emollient on eczematous skin in atopic dermatitis: biophysical and clinical evaluation

    Skin Pharmacology and Physiology · 2008 · doi:10.1159/000111134

    A glycerol-based emollient significantly increased stratum corneum hydration and supported barrier recovery on eczematous skin compared with placebo.

Masks that contain Glycerin