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Plant extracts

Lavender oil

Also listed as Lavandula angustifolia oil, lavender essential oil

Mostly a fragrance. There's no good evidence it treats skin, and air-oxidized lavender oil forms strong contact allergens.

Weak evidence

What it is

Lavender essential oil is mainly linalool and linalyl acetate. In body washes, lotions, soaps and deodorants it is there for scent, sometimes with 'calming' or 'bedtime' positioning.

Those terpenes react with air to form hydroperoxides, which are potent skin sensitizers, so older, air-exposed oil is more likely to cause allergy than fresh oil. Lavender products have also been linked in case reports to breast growth in children who used them regularly.

How strong is the evidence?

Weak evidence

There are no good trials showing lavender oil improves any skin condition when used in personal-care products, and aromatherapy findings don't transfer to a short wash-off exposure. Its allergy risk after oxidation is well documented. Case reports link regular lavender-product use with reversible breast growth in children, but causation is unproven.

What it's used for, checked

Soothing or healing skin

Unproven

No good trials in personal-care products.

Relaxation or better sleep from scented products

Unproven

Aromatherapy research is mixed, and the brief exposure from a wash or lotion hasn't been tested.

Antibacterial

Unproven

Lab activity only; not shown to matter in products.

Who should be careful

  • Oxidized lavender oil is a significant contact allergen; people with fragrance allergy, especially to linalool, should avoid it.
  • Case reports describe breast growth in prepubertal boys and girls using lavender products regularly, resolving after stopping. The link is not proven, but limiting use in young children is a cautious choice.
  • Essential oils count as fragrance, even in products marketed as 'natural'.

The studies

Every citation is checked against its PubMed record.

  1. Lavender oil lacks natural protection against autoxidation, forming strong contact allergens on air exposure.
    Hagvall L, Sköld M, Bråred-Christensson J, Börje A, Karlberg AT · Contact Dermatitis · 2008 · Laboratory + patch-test study

    Lavender oil's terpenes oxidized on air exposure to form hydroperoxides, raising its sensitizing potency in mice; patients allergic to oxidized linalool reacted on patch testing to air-exposed lavender oil.

  2. Prepubertal gynecomastia linked to lavender and tea tree oils.
    Henley DV, Lipson N, Korach KS, Bloch CA · New England Journal of Medicine · 2007 · Case series + laboratory study

    Three prepubertal boys developed breast enlargement while using products containing lavender and tea tree oils; it resolved after they stopped, and both oils showed weak estrogenic and anti-androgenic activity in human cell lines. Causation was disputed in later correspondence.

  3. Lavender Products Associated With Premature Thelarche and Prepubertal Gynecomastia: Case Reports and Endocrine-Disrupting Chemical Activities.
    Ramsey JT, Li Y, Arao Y, Naidu A, Coons LA, Diaz A, et al. · Journal of Clinical Endocrinology and Metabolism · 2019 · Case series + laboratory study

    Three girls and one boy with early breast growth and continuous exposure to lavender-fragranced products improved after stopping; several essential-oil components had estrogenic or anti-androgenic effects in cell lines, but whether real-world exposure is enough is unknown.