Facial serums are actually legit. I just started using one recently and it's been life-changing. I wash my face with face wash, tone, throw on some serum, then put my moisturizer on over top of it. In just under a week, my skin feels tighter and looks brighter. This is one of those preventative things that you don't think you need now but honestly will help you down the line. To be honest, serum is expensive. Including this type of product in your regime isn't for the faint of heart (or pocket), but it's worth it.
Budget: Brooklyn Grooming Pilgrim's Facial Serum ($36)
Moderate: Lab Series Future Rescue Repair Serum (~$46)
Luxury: Kiehl's Age Defender Power Serum ($50)