This Always Sold-Out Hair Growth Serum Is Back in Stock and on Sale Just for InStyle Readers

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Grab shopper-favorite serum while it’s 25 percent off.

<p>Instagram @actandacre</p>

Instagram @actandacre

I definitely wouldn’t mind growing thicker hair. Everytime I open a video designed to teach me how to nail a blowout or achieve the bounciest curls, I always come away with the same thought: If I want what they have, I first need more hair. Whether by genetics, stress, or one too many times bleaching, hair loss ends up affecting more of us than you might think, with one recent study citing that 50 percent of women can expect to experience it. But some shoppers might have discovered a solution and it’s currently on sale just for InStyle readers.

According to customers, Act + Acre’s Stem Cell Scalp Serum is a “game changer.” So much so, it’s almost always sold out. But the trichologist-founded haircare brand finally restocked its best-selling serum and is giving our readers 25 percent off of it — and 20 percent off everything else — with the code INSTYLE25.

<p>Act + Acre</p>

Act + Acre

$86

$65

Act + Acre believes that hair health starts at the scalp, with its Stem Cell Scalp Serum designed to hydrate the scalp, reduce flakiness, and improve the health of hair at the follicle, ultimately strengthening and thickening each strand. The serum is formulated with swiss apple stem cells, which the brand cites as being able to reduce shedding in just one month, as well aloe vera, which soothes and adds shine, with fans saying that even their “stylist is amazed at how healthy and shiny” their hair is.

“The overall health of my hair is improving,” said one shopper who noted that their “fine curls are becoming more defined and manageable” while their “tight scalp” is feeling more calmed. “[A] holy grail product,” raved another “obsessed” fan. “It transformed not only my scalp but my hair to its best (ever) state. I'm talking shine, bounce, [and] smoothness,” they said.

<p>Act + Acre</p>

Act + Acre

$86

$65

As for regrowth, many customers are amazed at how quickly they started seeing results. “I have been using it for a few weeks and my hair is noticeably thicker around the crown and people have commented on a difference they are seeing as well,” wrote one person while a fan over 65 years old said, “My hair felt fuller within a month of using it.” And according to a shopper who has “tried literally everything,” it took just a few weeks to see new growth, saying that their strands “look healthier and even feel thicker” after one month.

Now through October 23, grab the Stem Cell Scalp Serum while it's 25 percent off with the code INSTYLE25. And explore more shopper-favorite products — all 20 percent off with that same code — below.

3% Stem Cell Peptide Treatment

<p>Act + Acre</p>

Act + Acre

$120

$96

Microbiome Cooling Scalp Serum

<p>Act + Acre</p>

Act + Acre

$68

$54

2% Squalene Anti-Frizz Leave-In Conditioner

<p>Act + Acre</p>

Act + Acre

$48

$38

Vitamin E Scalp Detox Oil

<p>Act + Acre</p>

Act + Acre

$48

$36

BHA Salicylic Acid Scalp Exfoliator

<p>Act + Acre</p>

Act + Acre

$48

$38

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