I love Cerave–the PM version, without sunscreen. Some of the sunscreens in the AM version bother my skin, so I layer the PM version under my favorite sunscreen for daytime. The only thing I can think of is that it doesn’t have a high concentration of zinc oxide, so maybe the UVA coverage isn’t as high as it could be, say, for someone with hyperpigmentation (melasma, which I have)? I don’t know. I use a product with 9% ZO.