Formula · ingredient 1 of 6
Undecylenic Acid in the Nail Defender Formula
A naturally derived fatty acid, usually made from castor oil. It leads the label and is described as purifying and supportive of healthy skin balance.*
- TypeNaturally derived fatty acid
- Usual sourceCastor oil
- Place on labelFirst
- RolePurifying, skin balance*
What it is
Undecylenic acid is a naturally derived fatty acid. It is most often made from castor oil, the thick oil pressed from the seeds of the castor plant. In Nail Defender it is the first name on the label, which tells you it is the core of the formula.
Why Nail Defender uses it
The brand describes undecylenic acid as purifying and supportive of healthy skin balance. In a nail spray, that places it on the surface side of the formula, working on the area where daily nail care begins.*
Its partners on the label
It works next to clove bud oil, which supports a clean, balanced skin environment. The softer side of the formula, aloe and the oil blend, keeps the spray gentle and moisturizing.*
Getting the most from each spray
Spray onto clean, dry nails so the formula meets the surface directly. Our routine page covers each step.
Good to know: castor oil has been part of personal care for centuries. Undecylenic acid is one of the useful compounds made from it.
The other five ingredients
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All six ingredients in one Nail Defender spray
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