What it does
Tea tree oil has been studied for mild to moderate acne and shows genuine antibacterial effect — slower than benzoyl peroxide, but with fewer complaints about dryness in the studies that compared them.
The problem is how it is used. Applying it neat from the bottle to a spot is common advice and a good way to sensitise yourself; oxidised tea tree oil in particular is a known allergen. Diluted to a few percent in a formulated product is the sensible route.
It is also an essential oil, which means it belongs on the list of things to avoid if fragrance and botanicals irritate you.
In a routine
Layers well with
- Niacinamide
Do not layer with
- Retinol
- Exfoliating acids
Same routine is fine for some pairs — same step is the problem. Split them morning and evening when in doubt.
