Celebrity hairstylist Jen Atkin told me Ouai’s Scalp Serum is essential for healthy hair. Shop the growth serum shoppers say makes hair full, shiny, and soft at Amazon for $52.

One person saw a “visible difference” in their thickness in just a few weeks.

Put me in a salon chair and I become a toddler in their “why” phase. Why that shampoo, why that serum, what’s that spray? Sorry to be a nuisance, but I want salon-quality hair every day. Which is why when Hilton Honors American Express Business Card gave me the opportunity to speak with celebrity hair stylist Jen Atkin, I jumped on it.

Aktin has worked with everyone including Kendall Jenner, Hailey Bieber, Dua Lipa, and Chrissy Teigen, and they all have one thing in common: Great hair. And according to Atkin, the secret to having such healthy, lustrous hair is “making sure that you are taking care of your scalp,” telling me that it’s “just as important as the skin on your face.” And in case you’re not sure where to start, she recommends the Scalp Serum from Ouai, the hair care brand she founded.

Ouai Scalp Serum

Buy on Amazon $52

Ouai’s Scalp Serum keeps your “scalp regulated and hydrated,” Atkin said, which promotes not only healthier hair, but also growth. The serum is packed with adaptogens and hyaluronic acid, the latter of which locks in hydration. And according to shoppers, it makes hair softer, shinier, and yes, thicker.

One Amazon shopper reported that they saw a “visible difference” in their hair’s thickness in just two weeks. “It is thicker at the temples where I was thinning…my hair is actually growing,” they gushed. An 81-year-old fan was “elated” to find something that actually helps with their thinning hair, writing that they saw “new growth” after just a few weeks. And according to someone else, this serum made their “baby hairs grow like weeds.”

And while growth is one of the biggest reasons shoppers keep purchasing Ouai’s serum, other fans of the product love that it leaves their strands “so soft” and “shiny.” One customer said that this is the “healthiest” their hair has ever been—it’s smoother, more voluminous, and softer, they wrote—while another shared that their hair is “fuller, healthier” and shinier. 

For your best hair ever, Atkin swears by Ouai’s Scalp Serum, which you can grab for $52 at Amazon. Shop more staples from the brand, below. 

Fine to Medium Hair Treatment Masque

Buy on Amazon $38

Travel Size Hair Oil

Buy on Amazon $16

Fine Shampoo and Conditioner Set

Buy on Amazon $64