What Is Undecylenic Acid?

Undecylenic acid creates an environment fungus struggles to grow in, which is why it's been used in antifungal products for decades. We chose it for the press-ons specifically: it lets a cosmetic nail do double duty, covering discolored or damaged nails while delivering antifungal protection right at the nail, rather than just hiding the problem under plastic.

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Three-panel collage showing a person's feet and toes while using Dr. Anti Fungi treatment. Three-panel collage showing a person's feet and toes while using Dr. Anti Fungi treatment.
SAFETY

Undecylenic acid is a well-established OTC antifungal active for external
use. As with any topical, stop and consult a professional if irritation
develops or the condition worsens.

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