Each one the serums are qualify serums which you can tell. I can’t wait to use them continuously and keep seeing results. My favorite one would have to be the Retinoid serum because it gives such a nice GLOWY look and keeps my face hydrated. The vitamin C serum and the hyaluronic acid is such an important serum which is important for everyone to use on their face at least a few times a week for all the benefits. Taking care of your face is one of the best things you can do for yourself and this serums will do it!