8 Best Hair Thickening Products, According to Experts

Hair pros share their top recommendations.

We independently research, test, review, and recommend the best products—learn more about our process. If you buy something through our links, we may earn a commission.

Whether you have naturally fine hair, are experiencing temporary hair loss, or simply want to boost the volume levels you've already got, there’s an entire world of hair thickening products out there that can help create the illusion of a fuller-looking mane. And we're not just talking about hair growth products (which take some time to show results)—we're also talking about products that use technology like copolymers to create fullness instantly.


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To help find the best of the best hair thickening products available, we asked hair experts to weigh in with the products they swear by. From hair styling products that temporarily boost volume to topicals that promote hair growth, we’ve covered a range of options for you to choose from below. 

Best Hair Thickening Products

Keeps Topical Minoxidil Solution, 5%

hair-thickening-products-Keeps Topical Minoxidil Solution, 5%

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

hair-thickening-products-Nioxin Diamax Hair Thickening Treatment

“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

hair-thickening-products-R+Co Dallas Thickening Shampoo

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

hair-thickening-products-Evolvh Instavolume Volumizing Elixir

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

hair-thickening-products-The INKEY List Peptide Volumizing Hair Treatment

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

hair-thickening-products-Oribe Dry Texturizing Spray

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

hair-thickening-products-Kerafator Scalp Stimulating Serum

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. 

Toppik Hair Filler

hair-thickening-products-Toppik Hair Filler

If your hair is very thin or you can see far more of your scalp than you'd like, Toppik’s hair filler is a great solution to create a fuller-looking head of hair. 

“It's made of keratin fibers, just like real hair, that are dyed to match your color,” explains Dr. Yadev. “Once you dust it on, it grips to your natural hair and plumps up every strand. Plus, it's waterproof so it won't come off until you shampoo.”

She adds that you can help lock everything into place with a touch of your favorite hairspray. The product’s available in black, dark brown, medium brown, and medium blonde.

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