HYALURONIC ACID HYDRATING HAIR 3.4FLOZ. Benefits: A lack of hydration leads to brittleness and frizz in all hair types. This lightweight serum is formulated with optimized high- and low-molecular-weight hyaluronic acids to hydrate, reduce frizz, banish brittleness, and boost shin. Controls frizz and reduces brittleness. Adds shine. Hydrates. Key Ingredients: Resisthyal (Hyaluronic Acid) 2%: Hydrates hair, fighting frizz and brittleness.. Betaine 1%: Conditions hair, leaving it soft and healthy.. Panthenol 1%: Hydrates and moisturizes hair.. :