Biotin by Natural Factors $8.79 90 Tablets - $8.79 Size 90 Tablets 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Biotin (vitamin B7) is essential to the metabolism of carbohydrates and fats, and aids in the production and utilization of amino acids.* Biotin supplementation has been shown to increase the strength of nails and promote healthy hair.*