I have been using the HA Intensifier for 4 weeks. I love this new serum. I am 52 and have been using SkinCeuticals products for 13 years now. This serum has a lovely berry color to it, although it does not look like berry when put on your face. I use this in the morning after my CE Ferulic serum. It's have a good impact to me which helps me maintain a healthy and beautiful skin a long time.