The formula has all the good stuff you'd want from a hydrating face serum — hyaluronic acid, antioxidants, vitamin E — plus a small percentage of DHA, which makes it easy to build a believable ...

TruSkin Vitamin C serum is one of the most popular affordable face serums on Amazon ... Some of the before and after photos are truly inspirational. Mayowa O., “Best $20 ever spent!

Product photo courtesy of Guerlain; image ... my face now absorbs other lotions with more ease and efficacy. I am no scientist, but I have tried my fair share of face serums over the years ...

Cathy is a contributing writer at InStyle, and has more than 20 years of experience writing about beauty, wellness, fitness, and health. It’s often said your neck can reveal your true age.