Powered by a 14% Glycolic Acid Gloss Complex, this leave-in serum penetrates the hair fiber to improve quality and smoothness. It seals the cuticle with a lasting shine glaze, making hair up to twice as shiny, 88% smoother, and with 75% less frizz, lasting up to 10 washes. Ideal as the final step in the Glycolic Gloss routine.