4.8 star rating 11640 Reviews (taken from R+F website) Quench thirsty skin. Instantly boosts hydration levels by 200% by drawing in hydration to the surface of the skin. Add to any Regimen for even better results. Recommended Usage: Once daily, in the PM for normal, combination, or oily skin. Twice daily, in the AM+PM for dry skin Size: 30 mL / 1.0 Fl. Oz. U.S. What it is: A super-hydrating face serum that balances hydration levels and preps skin to better receive products applied after. Why you need it: Hydrated skin acts younger. This best-selling serum transforms dry skin into younger-looking, younger-acting skin that maintains continuous hydration for up to eight hours*. *Based on an 8-day U.S. clinical and consumer study. KEY CONCERNS Dry, Unnourished Skin KEY BENEFITS Boosts hydration levels by 200% for all-day hydration