What it is and why it's in the formula
Camphor oil (Cinnamomum camphora) is used in small, cosmetic amounts in many foot and nail sprays for the light cooling sensation it can create on application. It is one of the essential oils named in the formula's sensitivity notice, so it's worth patch testing first, particularly if you have a history of reacting to camphor-containing balms or rubs.
Patch test first: Camphor 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
Camphor 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.