The Glycolic Gloss Leave-In Serum envelops the hair fiber for extreme shine. Healthy-looking hair is shiny hair, because its smooth surface perfectly reflects light. On the other hand, damaged hair has a ruined cuticle and the fiber is rough, porous, and dull, unable to reflect light. Our first at-home Gloss Treatment, powered by Glycolic Acid, repairs the fiber from within, intensely improving hair quality and sealing the cuticles for long-lasting shine. Quantity: 150ml.