8 Best Hair Thickening Products, According to Experts

Keeps Topical Minoxidil Solution, 5%

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Rogaine has been around for decades and remains one of the best products for thickening hair. The hero ingredient found across the entire line of products is minoxidil, which is scientifically proven to help stimulate hair growth. 

“Minoxidil is an easy-to-use topical treatment that stimulates blood flow to stop thinning while promoting newer and thicker growth,” says Geeta Yadav, M.D., a board-certified dermatologist and founder of FACET Dermatology. “When using minoxidil, it's critical to get the product directly onto the scalp for it to work, so I recommend parting the hair in several places and massaging it in.” 

She adds that some minoxidil formulas can make the hair sticky or tough to manage, so it makes sense to apply it before bed versus in the daytime. That way, you have it on your head for a good six to nine hours but can rinse it away in the morning. Also note that minoxidil must be used daily to maintain results. Another one of Dr. Yadev’s preferred minoxidil products is Rogaine, which is available in 2% and 5% concentrations. 

Nioxin Diamax Hair Thickening Treatment

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“This hair thickening treatment works to improve hair fullness by increasing the thickness and diameter of the hair,” says Marisa Garshick, M.D., board-certified dermatologist. “It uses HTX technology that combines caffeine, niacinamide, and panthenol, which both thicken the hair and protect against breakage. For best results, apply it to wet or dry hair every day.

R+Co Dallas Thickening Shampoo

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This volumizing spray from R+Co is a superhero when it comes to boosting hair volume, body, and shine. It even tackles frizz. “The polymers bulk up the diameter of each individual strand for insane amounts of volume,” says Brittany Gharring, celebrity editorial stylist. 

This is also a favorite from Bryan Cantor, celebrity makeup artist, hair stylist, and groomer. “Spray this on your hair before you do your blowout, focusing more product on the roots, and then hold your head straight while blow drying your hair and lifting it up, perpendicular to the ground,” he says. “For maximum volume, blow-dry your roots by holding them flat against your head in the direction away from their natural fall.”

Evolvh Instavolume Volumizing Elixir

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If you’ve got flat and fine hair that’s often oily, this is a good one to add to your haircare arsenal. “It’s very effective in providing instant volume and thickness, and is also formulated with super-clean ingredients that are certified organic,” notes Shab Reslan, a trichologist and hair expert based in New York City. Along with ensuring your hair doesn’t fall flat within a day of shampooing, the formula helps detangle, nourish, and hydrate. 

The INKEY List Peptide Volumizing Hair Treatment

Buy on Sephora

This super-affordable, lightweight serum works best for people dealing with fine or limp hair. Reslan says, “It’s formulated with innovative volumizing ingredients, including 2% keranutri and 2% ACB Pisum Sativum Peptide.” 

These ingredients work to volumize and thicken, and as a bonus the formula conditions while it works. Simply work into damp hair, making sure to thinly and evenly coat your strands, then style per usual.  

Oribe Dry Texturizing Spray

Buy on Sephora

Make room on your shelf for this industry favorite that’s renowned for creating sky-high volume. “It’s best used after you have finished your blowout for added volume and texture,” notes Cantor.

To get the most out of your blowout, he recommends flipping your hair over and spraying the roots starting at the back. Lift each section gently and spritz, then flip back over and manipulate your hair into your preferred style. 

Kerafator Scalp Stimulating Serum

Buy on Mykerafactor.com

This innovative scalp stimulating serum is formulated with growth factors and proteins that help promote hair and scalp health. “The brand’s patented complex activates weak or resting hair follicles, improves circulation, and promotes healthier and thicker hair growth over time,” says Reslan. She recommends applying daily to a freshly washed scalp with a hair massaging brush. Aim for the hairline, part, top of your head, and anywhere else you notice thinning or loss.