I mean THIS. There are many hyaluronic acid products, but this was one of the first, and it's the best! I am 54 and hear I look 35-40 often and YAY!! Brilliant. ALWAYS have this product with you. Morning and Night and In-Between!!
The serum had a thin viscosity. Minutes after applying it, my skin became very dry. I followed with moisturizer but found over a few days that I had developed more dry patches on my face. This did not work for me. For reference, I have slightly dry to normal skin.