Don’t forget to use it on your neck to tackle horizontal lines. Why it's worth it: SkinMedica Retinol Complex 0.25 is a go-to for Dr. Penzi, who appreciates that it contains 0.25% retinol ...

I’ve been writing about beauty for the past seven years, and in that time there are few ingredients talked about or recommended as much as retinol. So much so that I can count on one hand the ...