Best Overall

Borboleta Lash Serum

$65

$59 at AmazonView on Borboleta.com

Key Ingredients: Biotin, peptides, keratin, plant-based stem cells | Cruelty-Free: Yes

Powered by a blend of biotin, peptides, keratin, and plant-based stem cells, this cruelty-free, ophthalmologist-tested, and clinically-tested lash growth serum is impressive. The serum applies quickly and easily with just one swipe of the small brush across the lash line. Its thin consistency dries down within seconds and doesn’t leave a sticky residue on the skin or between lashes.

While we didn’t notice a difference in the density or thickness of lashes, we were blown away by how well this serum worked at lengthening them. After consistently using the serum throughout our 12-week test, we noticed a significant improvement in the length of our eyelashes. The difference was so noticeable that a coworker (who had no idea we were testing a lash serum) complimented our eyelashes. If length is what you hope to improve, we highly recommend this formula.

Ashleigh, tester: “I am impressed with my results. My lashes are definitely longer! I was skeptical that this would work, but I am really happy to be proven wrong.”

Best Volumizing

Grande Cosmetics GrandeLASH-MD Serum

$36

$31 at Amazon$68 at Sephora$68 at Ulta

Key Ingredients: Peptides, amino acids, hyaluronic acid | Cruelty-Free: Yes

Chances are, you’ve either seen ads for the popular Grande Cosmetics GrandeLash-MD growth serum or know someone who’s tried it. We are seriously impressed by how well it thickens lashes and brows. The hair appears fuller, feels stronger, and is noticeably more breakage-resistant. In terms of the application, the fine brush applicator makes for a mess-free, targeted distribution without having to constantly re-dip into the tube. Do note that if you get the formula into your eyes, you might experience significant eye sensitivity. So, while we highly recommend this for people who are looking to thicken their lashes, we suggest taking your time to apply it very carefully.

Elena, tester: “It was amazing. I can see and feel the substantial difference in the thickness and strength of my lashes and brows. They’re thick, and honestly, they seem happier. Yes, my eyelashes seem happier.”

Best Strengthening

Vegamour GRO Lash Serum

$68

$65 at Amazon

$68

$55 at SephoraView on Vegamour.com

Key Ingredients: Amino acid peptides, red clover, mung bean | Cruelty-Free: Yes

If you’re dealing with brittle lashes or an increase in fallout, you’ll want to look for a strengthening formula to fortify your lashes over time. Senior Editor Shauna Beni-Haynes loved this one from Vegamour, noting that it made her eyelashes noticeably stronger and thicker within a few weeks. It comes with a thin, tiny brush for precise application, and it was easy to create smooth strokes across her lash line. The serum is lightweight, absorbing quickly without leaving a sticky residue behind. She also wears contact lenses, and the gentle formula felt comfortable on the eyes and didn’t cause any irritation or stinging. Alongside a clinically-tested amino acid peptide, it contains red clover and mung bean extracts—two ingredients that have been shown to improve hair growth.

She saw results in about four weeks—her lashes felt much stronger, and she saw less fallout when removing her mascara. While it didn’t make a big difference in length, they were noticeably denser at the end of the testing period.

Shauna Beni-Haynes, senior editor: “This product performed above and beyond compared to other lash serums I’ve tried. It truly makes them stronger and more dense.”

Best for Sensitive Eyes

Lancôme Cils Booster Lash Serum

$49

$47 at Amazon$49 at Ulta$49 at Nordstrom

Key Ingredients: Amino acids | Cruelty-Free: No

You may hesitate to use a lash serum if you have sensitive skin or eyes. If so, we recommend trying this one, which did not irritate our tester’s eczema-prone eyelids. The ophthalmologist-tested formula utilizes the power of amino acids to help fortify lashes damaged by improper eye makeup removal and consistent mascara application. Moreover, the brand claims this formula minimizes the amount of lashes that fall out during makeup removal.

Cindy, tester: “I enjoyed this product—it strengthened and lengthened my lashes, giving the illusion of fuller lashes. Plus, it did not aggravate or irritate my eczema at all.”

Best for Quick Results

RapidLash Eyelash Enhancing Serum

$46

$31 at AmazonView on Dermstore$50 at Target

Key Ingredients: Peptides, biotin, amino acids | Cruelty-Free: Yes

Eyelash growth serums require a consistent application and a whole lot of patience before you notice results; that’s just the nature of these products. But, with this pick, we noticed thickening and lengthening within just a few weeks, as lashes went from short and stubby to longer and more uniform. We also loved that the brush picks up just the right amount of the formula, and once applied, it absorbs within a matter of seconds without causing any irritation. It is not a budget option by any means, but for those looking to lengthen their lashes ASAP, it will do the trick.

Rachel, tester: “I definitely noticed a difference in my lashes after using this product, which I was very happy about. They grew a lot longer and uniform, although not quite as thick as I was expecting. Still, it did wonders for growth, and I am enjoying the overall fuller look.”

Best Splurge

RevitaLash Cosmetics Advanced Eyelash Conditioner

$59

$57 at Amazon

$100

$59 at Dermstore$100 at Nordstrom

Key Ingredients: Peptides, biotin, amino acids, vitamin B | Cruelty-Free: Yes

There’s no denying that this lash growth serum is expensive, but the results are very noticeable, so we can justify the price tag. Formulated with a blend of peptides, biotin, amino acids, and vitamins, it strengthens the lashes, protects against breakage, and significantly lengthens them. Throughout the testing period, we noticed eyelashes feeling stronger and more resistant to breakage, but the dramatic improvement in lash length really stood out. Easy application and noticeable results? Sign us up!

Agne, tester: “I look like I have doll eyes! After a month of use, my eyelashes basically doubled. I was expecting something only I would notice, but multiple people have now asked if I’ve gotten extensions or am wearing falsies.”