Science-Based Nutrition™ Supports Hair Strength & Hydration With KeraGLO® Dietary Supplement Non-GMO · Gluten Free · Soy Free At Doctor's Best, we are all about inner beauty. Our formula is a hydrolyzed form of keratin designed to provide nourishment to support hair vitality. Fueled by advanced scientific research, keratin is a promising choice for beauty from within. Supports hair brightness, density, and volume. Helps protect against hair damage from heat treatment.