Undecylenic Acid is a type of fatty Acid that helps prevent nail fungus. However, its benefits in improving your health are due to its anti-microbial properties. We can diagnose and treat foot and toenail fungal infection and can advise you on the best treatment. It has a wide customer fan base, and the reviews are largely in support of the results that the product provides. Antifungal drugs take time to fight the disease. Professional medical care is another option in severe fungal nail infections. Another downside is they act as a band-aid for the problem, and they don't address the reason why the fungus has developed. It helps in keeping the infection away for good and keeps the skin in good health for a long time. Then she developed the toenail and nail fungus.