Glycolic Gloss Shampoo repairs the hair fiber and adds shine. Healthy looking hair is shiny hair, because its smooth surface reflects light perfectly. On the other hand, damaged hair has a damaged cuticle and the fiber is brittle, porous and dull, unable to reflect light. Our first at-home Gloss Treatment, enhanced with Glycolic Acid, repairs the fiber from the inside, intensely improving the quality of the hair and seals the cuticle, providing long-lasting shine.