I got it on promo lesser price bigger size that's the first good point, and since i already use retinol previously this serum comes lighter on my skin. Good thing is even if that's the case, my skin starts to exfoliate, i feel it when washing my face in the morning. and it helps me on my break outs on the cream that i just recently use. But now this 2 blends well on my skin. so i will buy again if it is on promotional.. worth the try..