Kerassentials nail-fungus eliminator has been formulated in FDA-approved facilities and contains only natural ingredients. Other risk factors include diabetes, vascular insufficiency, or malnutrition. Use this Kerassentials serum to prevent fungus if you have brittle nails or toenail fungus. Some people may overgrow, resulting in infection and many symptoms, such as itching and unpleasant odors. Although it can also affect the fingernails and toenails, it is more common in these areas due to the warm and moist environment created by shoes or socks. This causes a weakening of the nails and can even cause the nail to separate from the nail bed. Apply the mixture twice daily to your fungal nails until the infection goes away.