Strengthen Hair & Nails Dietary Supplement Non GMO Gluten Free Vegan Kosher Parve Bluebonnet’s Beautiful Ally Biotin 10,000 mcg Capsules contain yeast-free biotin in its purest crystalline form. Biotin, often referred to as the beauty nutrient for youthful radiance, is a water-soluble B vitamin that delivers support for healthy hair and strong, durable nails.