What it is and why it's in the formula
Tea tree oil (Melaleuca alternifolia) is one of the most recognizable ingredients in nail and foot-care products, included here in a diluted, cosmetic concentration alongside 15 other oils. Because it is a genuine essential oil, it's one of the ingredients named in the formula's essential-oil sensitivity notice — a patch test 24 hours before first full use is recommended, and anyone with known sensitivities to tea tree oil should be especially cautious.
Patch test first: Tea Tree Oil is a genuine essential oil named in PureNail Pro's essential-oil sensitivity notice. Apply a small amount to a small area of skin and wait 24 hours before your first full application. Discontinue use and consult a doctor if irritation, redness, or discomfort develops.
Where it fits in the full formula
Tea Tree Oil is one of 16 ingredients disclosed openly on the PureNail Pro label — none of the formula sits behind vague "proprietary blend" wording. You can see the complete breakdown, including which oils pair with it, on the full ingredients page.