Bad hair days, beware: the best hair serums are the ultimate weapon to ward off every hair concern. “I like to think of serum for my hair as I would think of serum for my face,” says Shelley Gregory, stylist and Kérastase Pro-Club color expert. “It is one of the steps in your routine you do not skip.” Gregory recommends using a hair serum in addition to your other hair care favorites, as it will complement those products and boost their benefits.
According to stylists, adding a hair serum into your routine is one of the most effective ways to make your tresses healthier, more manageable, and look its very best. “Hair serums are great for all hair types,” explains Bianca Hillier, celebrity colorist for Nomad Model Management in Los Angeles. “If you have the right serum, it will help smooth, nourish, protect, and seal the hair.”
How we chose the best hair serums
We consulted stylists Gregory, Hillier, and Redl, the Good Housekeeping Institute, which tests countless products to ensure a fair and accurate representation of each item, and sifted through tons of online reviews to find the best hair serums available.
Our top picks
BEST OVERALL
This hair serum is the newest in the Olaplex lineup, and includes the patented bond-building technology exclusive to Olaplex. “It's special because unlike other serums that are just focused on the exterior of the hair, this one also targets the interior structure of the hair,” Hillier explains. Not only will this lightweight serum fight frizz and static, add shine, and nourish the hair, but it also uses antioxidants to aid with environmental and heat protection, preventing future damage.
Key Ingredients: Bis-aminopropyl diglycol dimaleate, antioxidants | Scent: Original | Size: 3 fl. oz.
BIOSILK
Silk Therapy Original Cure
If you’re in need of some serious shine, look no further than Biosilk’s self-proclaimed (and well-deserved title) original cure. This smoothing and nourishing serum delivers soft, shiny, healthy looking hair. With just a few drops in wet or dry hair, you’ll be on your way to hair that feels as great as it looks. “This is amazing,” one buyer writes. “It makes my hair so soft, shiny, and smooth.”
Key Ingredients: panthenol, silicone, ester of hydrolyzed silk | Scent: Amber | Size: 12.0 fl. oz.
Paul Mitchell
Super Skinny Serum
This super concentrated formula fights frizz with ease while providing a sleek, shiny, and smooth finish to the hair. Bonus: this serum works well to prime hair for heat styling while speeding up drying time. One reviewer noted this product made her hair smooth and shiny, and declared: “If I had to throw out every hair product I own except one, THIS would be the product I'd keep.”
Key Ingredients: silicones | Scent: apple, berries, and sweet floral | Size: 5.1 fl. oz., 8.5 fl. oz.
This serum by Pattern is another Good Housekeeping favorite. After testing, GH Beauty Lab scientists noted that “frizzy curls were left soft, smooth, and flexible after the treatment.” This rich, nourishing, oil-based serum smooths and moisturizes the hair for bouncy, touchable, and frizz-free curls.
Key Ingredients: Argan and other botanical oils| Scent: original | Size: 3.9 fl. oz.
OUAI
Hair Oil
Buy It Now
While technically an oil, this product functions much like a serum as it smooths and shines without weighing down the hair. Redl swears by this lightweight, multitasking oil for all hair types, but it’s especially effective for those with thicker hair that are looking for a super sleek finish. “My hair is super soft and shiny,” one reviewer writes. “I love that it didn’t make my hair greasy or flat. It’s good for thick, coarse hair.”
Key Ingredients: ama oil, borage oil, galanga root extract | Scent: violet, gardenia, white musk | Size: 1.5 fl. oz.
Kérastase
Resistance Serum
This transformative serum is Gregory’s top pick for damaged hair and split ends, and GH Beauty Lab scientists found that this serum “made damaged hair smooth and silky without weighing it down.” The dual-formula repairs and nourishes hair, helps with itchiness on the scalp, and offers heat protection for a multitasking formula ideal for damaged locks.
Key Ingredients: peptides, amino acids, protein | Scent: citrus, floral, woody | Size: 1.0 fl. oz.
BEST FOR SPLIT ENDS
Virtue
The Perfect Ending Split End Serum
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