I have been on this serum since two months. I love this formulation. It is like lotion like serum therefore quite think consistency. It's not thick on apication. Quite easily spreads and absorbs into your skin. I use it every two nights. I use sandwich technique with this retinol. It leaves my dry but plump in the morning. It does make you very dry which is quite expected of vitamin A products. I add extra hydrating toners in my next AM routine and it makes up for dryness. As currently winter months in our location I have added very thick ceramides based Moisturiser to help combat this issue. All in all I must say this product delivers over long use. You will see change gradually with consistent use. It helped reduce fine lines, pigmentation and dull tone.