The serum is actually one of the best I have used from liittlextrra rice berry. I have been using it for over three months now, and it has not ever caused my skin irritating. I prefer to place it on slightly wet skin after washing my face, then apply rice berry moisturizer. After that, I pat several drops of primrose oil on top to retain my skin from drying out. This routine functions very good for me. All in all, this serum has exceeded beyond what I anticipated, and I believe it's superb for anyone who needs to address dry skin, dark spots, and signs of ageing.