Ingredient glossary

Tea Tree Oil

INCI: Melaleuca Alternifolia Leaf Oil · Also: TTO

Decent support

A reasonable supporting ingredient. It helps a formula without being the star.

Does Tea Tree Oil clash with what you already use? Check it →

What it does

  • anti acne
  • antimicrobial
  • anti inflammatory

moderate evidenceRandomized double blind trials using five percent gel show greater reductions in lesion counts and acne severity index than placebo yet systematic reviews emphasize the small number and variable quality of studies.

On a label: usually effective at 5%.

Who it's for, and who should skip it

Tends to suit

  • oily
  • acne prone
  • combo

Approach with care

  • very sensitive
  • rosacea
  • eczema
  • fragrance allergy
  • Clogs poresModerate
  • Irritation riskModerate

Pregnancy: Check with your doctor before using during pregnancy or breastfeeding.

Plays well with

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Educational information about a cosmetic ingredient, not medical advice.