Act + Acre’s Stemp Call Scalp Serum is 30 percent off during the brand’s sitewide sale. Grab the hair-thickening serum shoppers say stopped hair loss and encouraged new growth while it’s $60.

Get the often-sold out serum while it's back in stock and 30 percent off.

I’ve spent most of my adult life obsessing over the ends of my hair: How can I stop them from splitting and make them softer? For the most part, the answer is pretty simple: a good leave-in conditioner and periodic trims. But when I started stressing about the thinning at the top of my head, the answer didn’t seem quite as clear.

That’s when Helen Reavey — a trichologist, hair stylist, and mastermind behind the famous brand Act + Acre — clued me in on the importance of scalp health. During a scalp consultation, she explained that improving it can lead to overall stronger follicles, resulting in thicker, healthier hair. Her recommendation? The brand’s Stem Cell Scalp Serum, which is currently 30 percent off during its sitewide spring sale (the discount will automatically apply in your cart).

Stem Cell Scalp Serum

Buy on Actandacre.com $86 $60

The Stem Cell Scalp Serum, now just $60, is designed to balance the scalp’s microbiome, pause hair loss, and promote new growth. The treatment is formulated with apple stem cells which, according to the brand, protect hair follicles from damage, leading to thicker strands. It also features calming aloe vera and hyaluronic acid; the end result is a soothed, hydrated scalp that’s primed for increased thickness.

In addition to being science-backed, the formula is also shopper-approved. The serum, which is often sold out, boasts nearly 700 perfect ratings, with customers raving that it does everything from encourage new growth to soften their strands. According to one person, the serum calmed their itchy, irritated scalp and reduced hair loss in just two weeks, while another said that they started to “notice little hairs growing in”  after a few weeks. “This product has made an incredible difference in the fullness of my hair in a relatively short time,” gushed another fan, while someone else reported seeing bald spots fill in and notable hairline growth.

And while this serum primarily targets hair loss and thickness, shoppers were also pleasantly surprised to find that it left their existing strands looking and feeling better. One person wrote that their scalp felt “refreshed and nourished,” while their hair “looked shinier and felt softer.” And per a customer with “frizzy and dry” hair, this serum smoothed it and added shine.

Act + Acre’s 30-percent-off sale is the perfect time to finally stock up on the brand’s famous treatments, including the often-sold out Stem Cell Scalp Serum. Grab it today for $60 and shop more of the brand’s best-sellers and new launches (including a hard water-filtering shower head), below.

BHA Salicylic Acid Scalp Exfoliator

Buy on Actandacre.com $48 $34

Microbiome Cooling Scalp Serum

Buy on Actandacre.com $68 $48

Vitamin E Scalp Detox Oil

Buy on Actandacre.com $48 $34

Showerhead Filter

Buy on Actandacre.com $120 $84