These 15 Hair Thickening Shampoos Are the Real Deal

I’ve tested each one on my uber-fine, flat hair.

girl with fine blonde hair and louis vuitton earrings
(Image credit: Getty)

I am the self-proclaimed president of the fine hair club. I *need* to shower every single day to avoid looking like a greasy mess, have dry shampoo on standby, and crave volume more than anything. As such, I’ve made it my beauty editor mission to uncover the best hair thickening shampoos in existence. Over the years, dozens upon dozens of shampoos promising fuller, healthier hair have taken up real estate in my shower. But these 15 are without a doubt, hands down, no questions asked, the best of the best. 

That in mind, it’s important to have realistic expectations with a thickening or volumizing shampoo. They’re not going to transform your genetically-given hair texture. But, they can reduce inflammation and detox the scalp to create an ideal environment for healthy hair growth. “Quite simply, a thickening shampoo will keep the scalp clean and clear of dirt and grease,” says hairstylist and trichologist Gregorio Ruggeri. “They’re helping to not only fight hair loss, but also promote hair growth.” 

At the same time, ingredients like biotin, green tea, caffeine, rosemary oil, saw palmetto, and more, are able to “create temporary density by swelling strands'' and “plump the cuticle,” so you “feel” results after one to three washes. While hair doesn’t grow overnight (you won’t notice a difference for at least three months), incorporating one of the best hair-thickening shampoos into your routine can be a game-changer. So without further ado, keep scrolling to shop my all-time favorites. 

Samantha Holender
Beauty Editor

Samantha Holender is the Beauty Editor at Marie Claire, where she reports on the best new launches, dives into the science behind skincare, and keeps up with the latest trends in the beauty space. She has previously written for Us Weekly, Popsugar,,, and Philadelphia Wedding. Follow her on Instagram @samholender.