The 8 Best Eyebrow Growth Serums For Thicker Arches, Backed By Experts

You may be familiar with the brand's beloved original GRO Brow Serum, but its advanced formula is on a whole new level for those with inflamed or irritated arches. With microencapsulated, broad-spectrum CBD, it helps calm and soothe the skin as the brow-enhancing actives (peptides, mung bean extract, red clover extract) get to work. 

I have pretty wimpy eyebrows (read: gappy and thin), but within just a few weeks of using this serum, I noticed my sparse tails finally starting to grow in. Along with hydrating aloe, fatty-acid-rich castor oil, and antioxidant-rich fruit extracts, it contains a patent-pending four-peptide complex to nourish the brows (and lashes) and accentuate fullness. Take it from someone who used it down to the very last drop: This formula provides noticeably denser arches.  

A trio of peptides, vegan keratin, hyaluronic acid, and panthenol make this 97% naturally derived formula oh-so-nourishing. Plus, it's ophthalmologist-tested and safety-tested to be safe for sensitive skin and eyes. In just 12 weeks, it can improve the length and health of your arches—and in the meantime, Kosas' peptide-infused Air Brow can help you fake a lush brow look. 

This $15 formula comes infused with high-quality peptide technology, green tea extract, and panthenol to moisturize the strands, as well as high-solubility caffeine to stimulate the follicles. In fact, one 2018 study shows that a caffeine-based liquid topical can be just as effective as Minoxidil, active in brands like Rogaine and the traditional topical treatment for hair loss. 

This luxe, potent formula is an antioxidant-rich powerhouse: It includes panthenol, vitamin A, vitamin E, vitamin C, white tea extract, licorice extract, eyebright extract, and rose flower water to protect the brows against free radicals, while peptides, hyaluronic acid, and hydrolyzed wheat protein help moisturize and encourage fullness. Not to mention, anything formulated by eyebrow expert Joey Healy is a safe bet—he's a true artist when it comes to maximizing the look and feel of your eyebrows, and his high-quality products don't disappoint. 

As a general rule, any brow serum also marketed as a lash serum should be safe to use on both regions (bonus points if it's ophthalmologist-tested, like Milk Makeup's formula), but the teeny applicator on this 90% naturally derived serum makes it A+ for coating the lash line. And if you have specific brow gaps you'd like to target, the brush makes it easy to create short, hair-like wisps in whatever areas you please. Perfect for those with sparser tails looking for precision.

This all-natural number contains just five ingredients: jojoba oil, moringa oil, castor oil, frankincense oil, and geranium oil. If your brittle brow hairs are in desperate need of all-day moisture, you can't go wrong with this conditioning pick. Bonus: The dense oils can help coax your brows into shape, too. 

The star of the show here is ProCelinyl, a hi-tech ingredient that has been shown to actually reactivate dormant hair follicles and promote hair growth (you'll also find it in the brand's Hair Revival Serum). The ingredient fights hair loss at the source, and it has been shown to enhance brow thickness in six to eight weeks. The brand is so confident in its efficacy, in fact, that if you don't start seeing results after 90 days, it'll refund your purchase.