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Tea Tree Oil
What Is Tea Tree Oil in Skincare?
Tea tree oil is an essential oil steam-distilled from the leaves of Melaleuca alternifolia, a small tree native to New South Wales and Queensland, Australia. In skincare it is used for its clean, medicinal scent and its antimicrobial activity, mostly in cleansers, shampoos, and spot products for oily or blemish-prone skin.
EWG Skin Deep rating for Tea Tree Oil
It is potent. Tea tree oil is one of the essential oils where the safe amount is small, especially in products you leave on your face, and where freshness matters as much as dose.
Quick Facts
| INCI name | Melaleuca Alternifolia (Tea Tree) Leaf Oil |
|---|---|
| Common names | Tea tree oil, melaleuca oil, ti tree oil, TTO |
| Source | Steam distillation of leaves and terminal branches of Melaleuca alternifolia, Australia |
| Form | Clear to pale yellow volatile liquid |
| Solubility | Oil soluble; needs a solubilizer to go into water-based products |
| Main active constituent | Terpinen-4-ol (quality is defined by the international standard ISO 4730) |
| Usage rate (EU SCCS, 2025) | Face cream (leave-on): up to 0.1%. Face wash: up to 1%. Shower gel: up to 1%. Shampoo: up to 2% |
| Skin types | Oily, combination, and blemish-prone skin, in rinse-off products first |
How Tea Tree Oil Works on the Skin
Tea tree oil is a mix of about 100 compounds, mostly monoterpenes. Terpinen-4-ol is the main one and is responsible for most of its antimicrobial activity. In lab studies reviewed by Carson, Hammer, and Riley in Clinical Microbiology Reviews (2006), tea tree oil and terpinen-4-ol were active against a wide range of bacteria and fungi, largely by disrupting microbial cell membranes. These were lab (in vitro) results, not tests of a cosmetic on skin.
In a cleanser or a clarifying product, that activity is why tea tree oil is used for skin that looks oily, congested, or prone to blemishes. It helps a product leave skin feeling clean and fresh. It is not a moisturizer and does not add nutrients to the skin, despite what older articles claim.
The safety picture
Tea tree oil oxidizes easily when exposed to air, light, heat, or moisture. Its oxidation products are much more likely to cause skin sensitization (an allergic reaction that can develop with repeated use) than fresh oil. In 2025 the European Commission's Scientific Committee on Consumer Safety (SCCS) classified tea tree oil as a moderate skin sensitizer and set the limits shown in the table above for oil that meets ISO 4730. In 2026 the US Cosmetic Ingredient Review Expert Panel found tea tree ingredients safe as used when formulated to be non-sensitizing, and noted that oxidized tea tree oil could be a sensitizer.
How to Use Tea Tree Oil in DIY Formulas
- Respect the limits. Keep leave-on face products at or below 0.1% (using the house rate of 9 drops = 1% per fl oz, that is less than 1 drop per fl oz, so make leave-on batches of 2 fl oz or more and use 1 drop). For a face wash, 1% is the top of the SCCS range: about 0.3 g, or roughly 9 drops, in 1 fl oz (30 ml).
- Add it in the cool-down phase. Stir it in below 40°C (104°F). It is volatile, and heat speeds oxidation.
- Solubilize it. In water-based cleansers and toners, premix the oil with a solubilizer (such as polysorbate 20 or a natural solubilizer at the supplier's ratio) before adding it to water.
- It is not a preservative. Tea tree oil does not replace a broad-spectrum preservative in any product that contains water. See our guide to natural cosmetic preservatives.
- Buy fresh, store cold. Choose oil certified to ISO 4730, buy small bottles, keep them tightly capped in a dark glass bottle in the refrigerator, and replace an opened bottle within about a year or sooner if the scent turns sharp or harsh.
- Never use it neat on the face. Undiluted tea tree oil is a common cause of reactions.
Who Tea Tree Oil Suits
Tea tree oil suits oily, combination, and blemish-prone skin, best in a rinse-off cleanser where contact time is short. It is a poor choice for very dry or easily reactive skin. If you have sensitive skin, patch test first on the inner arm for 24 hours and start at the lowest rate (well under the 0.1% leave-on limit, or a rinse-off product), then work up. Keep it away from the eyes, and do not use it on pets, especially cats.
For a complete routine for this skin type, see our oily or blemished skin collection. Gentler botanicals for the same goal include witch hazel and lavender.
Frequently Asked Questions
How do I use tea tree oil on my face?
Use it diluted, never neat. The EU safety committee set 0.1% as the upper limit for leave-on face cream and 1% for face wash, so a rinse-off cleanser is the easiest way to use it. Apply, massage gently, and rinse well.
Can I put tea tree oil directly on a blemish?
Undiluted oil is not recommended. Concentrated essential oils are a frequent cause of skin reactions, and the risk rises as the oil ages and oxidizes. A properly diluted spot product or a tea tree cleanser is a safer choice.
How much tea tree oil can I put in a face cream?
No more than 0.1% for leave-on face cream, according to the 2025 SCCS opinion. At the house rate of 9 drops = 1% per fl oz, that is less than 1 drop per fl oz, which is far lower than the 2% to 5% often quoted online.
Can I use tea tree oil on my scalp?
Yes, in a rinse-off shampoo. The SCCS set 2% as the upper limit for shampoo. Massage it into the scalp and rinse thoroughly, and stop if you notice stinging or redness.
Why does my tea tree oil smell different than when I bought it?
A sharper, harsher scent usually means the oil has oxidized. Oxidized tea tree oil is more likely to cause sensitization. Replace it, and store new bottles tightly capped in the refrigerator.
Is tea tree oil the same as melaleuca oil?
Yes. Melaleuca oil and ti tree oil are other names for oil from Melaleuca alternifolia. Cajeput and niaouli oils come from related species and have a different composition.
Shop and Learn More
The toner that once appeared in this collection has been retired. Explore our essential oils and aromatherapy guide for how to choose and dilute essential oils safely.
Sources
- Carson CF, Hammer KA, Riley TV. Melaleuca alternifolia (Tea Tree) oil: a review of antimicrobial and other medicinal properties. Clin Microbiol Rev. 2006;19(1):50-62. PMC
- European Commission Scientific Committee on Consumer Safety (SCCS). Final opinion on Tea Tree Oil, November 2025. Summary: Personal Care Magazine
- Fiume MM, Bergfeld WF, Belsito DV, et al. Safety Assessment of Melaleuca alternifolia (Tea Tree)-Derived Ingredients as Used in Cosmetics. Cosmetic Ingredient Review Expert Panel. 2026. doi:10.1177/10915818261460875
These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.
About the Author
Written by Kari Thomas, cosmetic formulator and founder of Skin Perfection.