My skin, particularly forehead felt a little tight and as soon as I applied the hydration booster, I felt a difference. After 4 weeks my skin felt smoother and more hydrated. Week 4 I had a 3 hour flight that would normally dry my skin, very windy in QLD and aircon with a 6 hour flight home. My skin was put through the test, yet it remain hydrated. A little goes a long way and I will continue to use it and highly recommend it. The hydration booster is a welcomed addition to my MUD routine