What it does
- Provides antimicrobial support for blemish-prone skin and scalp.
- Helps clarify and refresh oily skin and scalp.
- A popular natural active in anti-blemish and scalp products.
How it works
Tea tree oil's antimicrobial activity comes mainly from terpinen-4-ol and is widely documented. As an essential oil it must be used within dermal-safety limits, contains fragrance allergens, and can be irritating or sensitising if overdosed; it should be well diluted and oxidation-controlled.
Use level
- Typical use level
- typically 0.5–2% (with allergen assessment)
Commonly used at 0.5–2% with proper dermal-limit and allergen assessment; keep it well diluted and protected from oxidation.
Formulation considerations
- Oil-soluble essential oil; use within dermal-safety limits.
- Contains fragrance allergens subject to labelling.
- Oxidises over time — protect and control quality.
What it pairs with & what to avoid
Pairs well with
- Niacinamide, zinc (blemish/scalp)
- Soothing actives (to offset potential irritation)
Use with care / avoid
- Overdosing (irritation/sensitisation)
- Using oxidised oil
Regulatory status
Tea tree leaf oil is listed in the EU CosIng database; it contains fragrance allergens and is subject to dermal-limit and labelling considerations.
Common questions
What is tea tree oil good for?
Antimicrobial support for blemish-prone skin and scalp; it is a popular natural clarifying active.
What percentage of tea tree oil is safe?
Commonly 0.5–2% with proper allergen and dermal-limit assessment; more can irritate.
Does tea tree oil expire?
It oxidises over time, which raises irritation potential — quality control and antioxidants help.