What it is and why it's in the formula
Menthol is included at a cosmetic level to create the brief cooling sensation many people associate with foot and nail sprays right after misting. It's named alongside the essential oils in the sensitivity notice — most people find the sensation mild and short-lived, but a patch test is the safest way to confirm that in advance.
Patch test first: Menthol 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
Menthol 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.