The 11 Best Eyebrow Serums for Full and Fluffy Brows, According to Testers

Best Overall

neuLash neuBROW Enhancing Serum

$75 at Amazon $85 at Nordstrom View on Dermstore

Active Ingredients: Biotin, amino acids, peptides | Size: 0.12 oz | Dosage: Twice daily | Cruelty-Free: Yes

You’ve likely heard of biotin as a superstar ingredient for hair, skin, and nails. Well, it works wonders on brows, too. Alongside biotin, this formula boasts a potent protein complex full of amino acids, keratin, and peptides to keep your brows strong and healthy rather than sparse and fragile. To call our tester impressed is an understatement; she says this serum gave her the brows she’d always dreamed of. It was easy to apply, comfortable to wear—including underneath her go-to brow gel—and made her brows look shiny and full. After three weeks of consistent use, her brows were stronger, thicker, and more even-looking. The improvement was so significant that she ditched her brow pencil and gel to go au natural.

Caitlin, tester: “I over tweezed and waxed in my teens and 20s, and thought I would never have full, strong brows again. This brow serum changed my life! My brows have been completely rejuvenated—they are not patchy or sparse, just full, thick, and lustrous.”

Best Budget

e.l.f. Enhancing Lash & Brow Serum

$8 at Amazon $8 at Target $8 at Ulta

Active Ingredients: Camellia sinensis leaf extract, castor oil, ginseng | Size: 0.12 oz | Dosage: Twice daily | Cruelty-Free: Yes

If you’re seeking a budget-friendly product that still delivers noticeable results, reach for this one. The multitasking formula calls on castor oil, ginseng, and camellia sinensis leaf (aka green tea) extract to boost lash and brow growth with twice-daily use. According to our tester, the serum works quickly; after only one week, she began to notice more fullness in her brows and eyelashes. Although there wasn’t a noteworthy improvement in strength, her brows looked shinier and had a more even, filled-in appearance than before.

Danielle, tester: “The serum helped with fullness—on eyelashes too! My eyebrows still have patchy areas after use, but they definitely filled out a bit because of the serum.”

Best for Patchy Brows

Augustinus Bader The Eyebrow & Lash Enhancing Serum

$155 at Amazon $155 at Sephora $155 at Saks Fifth Avenue

Active Ingredients: Biotin, Roselle, and Safflower Extracts | Size: 0.3 oz | Dosage: Twice daily | Cruelty-Free: Yes

If you went a little wild with the tweezers a few years ago and are now dealing with sparse patches that refuse to grow back, this is the serum for you. Enriched with biotin to improve hair strength, safflower extract to stimulate growth, and hyaluronic acid to moisturize, this formula helps revive follicles and reduce shedding, leaving brows and lashes noticeably thicker and healthier. It’s not the fastest-acting formula; our tester said it took at least two months of diligent twice-daily application, but when the results kicked in, they blew her away. After 12 weeks, her brow prominence increased by 25%, according to her estimations. Even stubbornly patchy areas like the inner and outer edges of her brows filled in significantly. The only downside is that the applicator can get messy, resulting in wasted serum, which isn’t ideal at this higher-end price point.

Ashley, tester: “This serum helped stimulate new hair growth and gave me fuller-looking brows. My right eyebrow, especially, had patchy areas that the Augustinus Bader serum helped fill in.”

Best Fast-Acting Formula

Grande Cosmetics GrandeBROW Brow Enhancing Serum

$73 at Amazon $73 $38 at Sephora $73 at Target

Active Ingredients: Castor oil, beetroot extract | Size: 0.12 oz | Dosage: Once daily | Cruelty-Free: Yes

Wouldn’t be caught dead with a bare brow? Try this serum-meets-gel formula from Grande Cosmetics, which comes in three tints to suit light, medium, and dark hair. Applied once daily, it coats brows with fine fibers, creating a fuller appearance instantly. Meanwhile, moisturizing castor oil and B-vitamin-rich beetroot extract boost the hair’s health, encouraging natural growth. Our tester appreciated how well-groomed her brows looked after a light application of this formula (too much product and they became clumpy). With consistent use, she noticed her brows were stronger, less prone to falling out, and had a much fuller appearance overall.

Wendy, tester (not shown): “I see noticeable results immediately after applying it, and my brows look fuller and groomed. After a little over a month, I started to see that my natural brows have become more full with less sparse spots even without applying it.”

Best Multitasker

Kosas Brow & Lash Boosting Serum

$48 at Amazon $48 at Sephora View on Kosas.com

Active Ingredients: Peptides, keratin, provitamin B5 | Size: 0.12 oz | Dosage: Once daily, PM | Cruelty-Free: Yes

Strong, full brows and long, fluttery eyelashes are a dream combo—this multitasking formula is designed to achieve both. It’s made with a powerhouse blend of peptides and keratin to fortify the hair and provitamin B5 for smoothness and shine. Our tester loved the slender doe foot tip, which made precision application really easy, and the texture of the serum, which was so lightweight it was barely perceptible. With a month of consistent use, her brows felt stronger and were less prone to falling out. They also appeared longer, which helped disguise patchy areas and gave the impression of a fuller brow.

Lauren, tester: “I’ve definitely noticed that my brow hairs feel stronger and seem less prone to falling out since I started using the serum.”

Best Natural

Milk Makeup Lash + Brow Enhancing Serum

$50 at Amazon $52 at Sephora $52 at Kohls.com

Active Ingredients: Peptides, hemp seed, aloe, B5, and quinoa | Size: 0.12 oz | Dosage: Twice daily | Cruelty-Free: Yes

If you prefer to use natural products in your beauty regimen, you’ll appreciate that this serum contains 90% natural ingredients. Specifically, it uses peptides to help strengthen brows and hemp seed extract, aloe, B5, and quinoa to hydrate them. Our tester loved how conditioning and pampering this formula was. She applied it like a clear brow gel and let it dry for a couple of minutes before adding her usual eyebrow pencil over the top. With time, she noticed her brows required less and less pencil—they were looking full and filled in thanks to the serum. The results did seem to plateau after a couple of months, which is natural, given that brows have a natural growth and shedding cycle like the rest of our hair.

Samantha, tester: “I feel as if the product made my brows fuller, for sure. I have some patchiness toward the ends of my brows, and I noticed this area took less time and effort to fill in, as well. The change to my brows was subtle, but there was a change nonetheless.”

Best for High-Shine

Olaplex Browbond Building Serum Eyebrow Enhancer

$68 at Sephora $68 $58 at Nordstrom View on Olaplex.com

Active Ingredients: Peptides, oat extract, vitamins B5 & B7 | Size: 0.11 oz | Dosage: Twice daily | Cruelty-Free: Yes

It’s the Olaplex bond-building formula you know and love reimagined for brows! The multi-peptide treatment targets brittle, dry hairs and leaves them stronger, softer, and more supple. It even claims to reduce new grays, giving brows a more youthful appearance. Our tester loved how quick and easy it was to apply the product using the doe foot applicator. It dried quickly and layered well under makeup, holding her brows in place throughout the day. She loved how shiny and nourished her brows looked, and the long-term results were equally impressive—the treatment noticeably gave her thicker, denser brows by the end of the testing period.

Candice, tester: “As I’m studying my before and after pictures, I see a big difference in fullness and thickness. The product really helped by giving me denser and healthier-looking brows.”

Best Applicator

RapidLash RapidBrow Eyebrow Enhancing Serum

$43 $36 at Amazon $50 at Target $50 at Dermstore

Active Ingredients: Polypeptides, biotin, keratin, vitamin B5, apple fruit cell extract | Size: 0.1 oz | Dosage: Twice daily | Cruelty-Free: Yes

When you’re trying to introduce a new beauty product into your daily rotation, ease of application is everything. Our tester loved the spoolie brush on this pick, which gives an even distribution of product and doubles as a brow styling tool. The formula also excels; it’s packed with a laundry list of powerful strengthening actives, including our old friends biotin, keratin, and peptides. Plus, hydrating vitamin B5 and sweet almond oil for a touch of healthy-looking shine. Our tester says it absorbed in less than a minute and left her brows feeling moisturized but never oily. With a couple of weeks of use, she noticed her eyebrows seemed stronger, and it even helped fill the inner edges of her brows, which tend to be a little sparse.

Olivia, tester: “The application process is very easy and the serum comes with an applicator that you use to brush the product onto your eyebrows. My eyebrows feel stronger and appear more nourished after consistent use of the serum.”

Best Fast-Absorbing

Shiseido Full Lash and Brow Serum

$36 at Amazon View on Shiseido.com $36 at Macy's

Active Ingredients: Arginine, glycerin | Size: 0.21 oz | Dosage: Twice daily | Cruelty-Free: Yes

If you’re planning to use your brow serum in the morning before applying makeup, then you’ll need a fast-absorbing formula. This one quickly soaks into skin and brows, according to our tester, and it doesn’t leave a crunchy residue behind—just a lingering softness and shine. The formula’s star ingredient is arginine, an essential amino acid that promotes hair growth. Our tester didn’t notice much improvement in terms of growth and strength, but her brows definitely looked healthier than before she began the treatment.

Jessica, tester: “It didn’t leave any residue or film. Immediately after each use, you couldn’t notice any product on my brows. They were very soft and had a nice shine.”

Best Lightweight

The Ordinary Lash and Brow Serum

View on Sephora $15 at Amazon $15 at Sephora

Active Ingredients: Peptides, panthenol, camellia sinensis leaf extract | Size: 0.16 oz | Dosage: Twice daily | Cruelty-Free: Yes

While some brow serums can feel sticky, this one practically vanishes on application. The lightweight, clear formula absorbs in 30 seconds flat, creating a subtle shine that lasts around an hour. Enriched with multiple peptides, the formula actively strengthens brittle hairs, and our tester noticed his brows grew much thicker and fuller within a couple of weeks. He experienced less shedding and even saw new growth on the inner corner of his brow, where it meets his nose. His only complaint was that the applicator tip didn’t hold much product, so he had to re-dip it several times during each application.

Saleam, tester: “It leaves my brows feeling soft, almost as if I haven’t applied anything. I’m not sure how they achieve that, but I like it. My brows don’t feel crunchy or altered, and it doesn’t feel like I’ve used a brow wax or gel. It just feels light and transparent.”

Best Conditioning

RevitaLash RevitaBrow Conditioner Serum

View on Revitalash.com

Active Ingredients: Peptides, biotin, lipids, and green tea extract, ginseng | Size: 3, 1.4 oz | Dosage: Once daily | Cruelty-Free: Yes

RevitaLash’s award-winning RevitaBrow Advanced Eyebrow Conditioner was formulated by physicians to target the visible signs of eyebrow aging, including environmental damage and over-grooming. Formulated with peptides, biotin, and green tea extract to speed up growth, plus amino acids to strengthen and calendula to moisturize, it's like a protein shake for your brows—packed with everything they need to grow stronger, fuller, and healthier. Our tester gave the serum a rave review for its conditioning abilities, noting that her brows felt softer and shinier than ever. While she didn’t notice any big changes to the thickness or length of her brows during the testing period, they looked and felt undeniably healthier thanks to this conditioner.

Ashley, tester: “This conditioned my brows really well, leaving them looking shinier and healthier.”