Biotin is a water-soluble B-vitamin found in the body that helps convert certain nutrients into energy and plays an important role in the health of hair, skin and nails. In shampoos and conditioners, this ingredient is used to help promote shinier, healthier-looking hair. In lash-enhancing beauty products, this ingredient is used to help improve the appearance of natural lash length, thickness, density and fullness.
Peter Thomas Roth Products with Biotin:
Mega-Rich® Nourishing Conditioner
Mega-Rich® Nourishing Shampoo