I'm really enjoying this retinol serum. It´s easy to apply, a little goes a long way, it´s really hydrating without being heavy or oily and didn´t irritate my sensitive skin. I love that it combines both retinol+retinal but I would love it even more if the percentage of retinol or retinal was higher since my skin can tolerate it and it would give even more benefits. It did make a big difference in my skin quicky mostly because of the other ingredients in the formula , the retinol benefits will show up later for sure. It's definitely a new favorite.