WHAT IT IS: A lightweight serum formulated with optimized high and low molecular weight Hyaluronic Acids, which helps to hydrate, reduce frizz and brittleness to improve shine, whilst helping to protect hair from the impact caused by environmental pollution. Hyaluronic acid is a classic ingredient, traditionally known in skincare for its highly hydrating properties. Lack of hydration in the hair can be caused by several factors, including over washing, water temperature being too high, using heated tools without heat protection or humidity. When your hair becomes dry, the hair cuticle is rough and open, causing hair to lose moisture and become frizzy. WHO IT'S FOR: All hair types, even those with sensitive skin. KEY INGREDIENTS: 2% RESISTHYAL**containing optimized high and low molecular weight Hyaluronic Acids, helps to hydrate, reduce frizz and brittleness to improve shine, whilst helping to protect hair from the impact caused by environmental pollution. 1% BETAINE helps to condition hair, leaving it soft and healthy 1% PANTHENOL helps to hydrate and moisturize hair **Resisthyal is a trademark of Givaudan and is used with permission. PRODUCT CLAIMS: 83% agreed that their hair looked less frizzy after 4 weeks of use. * *Data based on consumer testing on 51 participants formula containing 2% RESISTHYAL This product contains no animal derivatives and is alcohol and fragrance free.