A natural oil-based supplement called Kerassentials has been developed to combat the negative effects of fungal infections on the skin, nails and hair. In fact, Kerassentials is often marketed as a product to help you maintain healthy skin, improve the condition of your nails, and treat fungal nail infections while also preventing sudden and unwanted growth of your nails. nail fungus. Natural substances that fight bacterial and fungal infections are used in the liquid mixture of Kerassentials.