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Benzyl Alcohol

Well toleratedPreservativepreservativesolventfragranceEU-declared fragrance allergen

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

Also written as: Phenylmethanol · Benzenemethanol · Phenylcarbinol

What it is

Benzyl alcohol occurs naturally in jasmine, ylang-ylang and balsams, and is also made synthetically. In cosmetics it does three jobs at once: it slows microbial growth, dissolves other ingredients, and adds a faint sweet-floral note. Because it is one of the EU's listed fragrance allergens, it has to be named on the label whenever it exceeds a low threshold, which is why it appears so often at the end of ingredient lists, even in products with no added perfume.

What it does well

  • Broad-spectrum preservation that works across a wide pH range

    Unlike benzoates and sorbates it does not depend on an acidic pH, so it suits neutral gel masks and creams. It is often combined with dehydroacetic acid or benzoic acid.

    Moderate evidence

  • Despite its allergen label, it very rarely causes contact allergy

    In a study of 70,867 patch-tested patients, only 0.21% reacted, mostly weakly and mainly among people with stasis dermatitis. The authors concluded benzyl alcohol cannot be regarded as a significant contact allergen.

    Strong evidence

Worth knowing

  • Must be declared as a fragrance allergen, which can be alarming out of context

    EU rules require it to be listed once it exceeds 0.001% in a leave-on product or 0.01% in a rinse-off product. The declaration reflects a legal labelling rule, not evidence that the ingredient is a strong sensitiser.

    Matters most toPeople with a diagnosed fragrance allergy who use the allergen list to screen products.

  • Can sting on broken or inflamed skin

    As a solvent it can be mildly irritating on compromised skin barriers, particularly at the upper end of the permitted range.

    Matters most toPeople with eczema, open cracks or a freshly exfoliated barrier.

Where the EU stands

Approved preservative (Annex V)

Permitted preservative up to 1.0%; other uses (solvent, perfume) are governed by Annex III entry 45, which also requires it to be named on the label above 0.001% in leave-on and 0.01% in rinse-off products.

Regulation (EC) No 1223/2009, Annex V entry 34 and Annex III entry 45 · source ↗

Sources (2)

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

  1. [1]
    Is benzyl alcohol a significant contact sensitizer?

    Journal of the European Academy of Dermatology and Venereology · 2022 · doi:10.1111/jdv.17968

    Among 70,867 patch-tested patients only 0.21% reacted to benzyl alcohol, leading the authors to conclude it is not a significant contact allergen.

  2. [2]
    Final report on the safety assessment of Benzyl Alcohol, Benzoic Acid, and Sodium Benzoate

    International Journal of Toxicology (Cosmetic Ingredient Review) · 2001

    The expert panel concluded benzyl alcohol is safe for use in cosmetic products at the concentrations reviewed.

Masks that contain Benzyl Alcohol