In one line
Undecylenic acid is the first name on the Nail Defender label, and it sets the tone for the whole spray.
Where it comes from
It is a fatty acid that comes from castor oil, the thick oil pressed from castor beans. The beans grow in warm regions around the world, and the oil has been used in personal care for a very long time.
Its job on the label
The brand describes undecylenic acid as known for its purifying properties and its ability to support healthy skin balance.* In a nail spray, that places it at the front of the formula, where it helps the spray focus on the nail surface.*
Works alongside
Undecylenic acid leads, with clove oil and lavender oil adding botanical oils, while aloe leaf extract and the nourishing oil blend bring moisture.
A small everyday tip
Start with clean, dry nails each time you spray. A tidy surface lets the spray sit just where you want it.
Read next
See how all six names fit together in six ingredients in the spray.