A pump of smoothing hair serum can definitely help you achieve silky, frizz-free hair, if that's a priority for you. But the best serums for frizzy hair don’t need to be used solely for taming flyaways. And even if you don’t have frizz-prone hair, or you don’t really care about their hair-smoothing properties, you can still benefit from these serums’ many other great qualities. For instance: All of the serums on this list will hydrate dry hair, give it some luster, and offer protection from heat styling tools, pollution, and other aggressors that can sap strength and shine. Certain formulas can actually repair damage on a molecular level, while others can boost color retention in dyed hair.
A word on hair serum best practices: Unless your particular product directs otherwise, there’s almost no wrong way to use a hair serum. Use it on towel-dried hair before blow-drying, or on dry hair before curling or flat-ironing for heat protection. Apply it to wet hair (before air-drying or blow-drying, doesn’t really matter) to prevent future frizz, or on dry hair to tame existing frizz.
Generally, stylists recommend applying serum at the ends of your hair, where the cuticle is older and most in need of hydration and protection. Then you can work the product through with your fingers (or a brush, if you’re feeling Marcia Brady about it), then touch up near your roots, around your hairline, or wherever else you want a little extra smoothness and shine. For the best results, apply your serum on freshly washed hair.
With that in mind, any of these hardworking serums will make your hair stronger, safer — and, yes, smoother — with every dollop.