Natrol biotin description: maximum strength promotes healthy hair and strong nails supports cellular energy production biotin is an important b-vitamin that provides dietary support for healthy hair and nails as well as energy production. By supporting the matrix of hair and nails, biotin promotes shiny, lustrous hair and strong, resilient nails. Free of yeast, but contains wheat, corn, milk, egg, soy, glutens, artificial colors and flavors, added sugar, starch and preservatives. Disclaimer these statements have not been evaluated by the fda. These products are not intended to diagnose, treat, cure, or prevent any disease.