15 Best Eyelash Serums for Long, Thick Lashes (Tested and Reviewed for 2024)

Legit, every facialist compliments how thick my lashes are—and it’s all thanks to swiping this serum on my lashes every night for two months straight. It uses L-proline, an amino acid, to help strengthen my lashes, along with hyaluronic acid and aloe vera to help hydrate them. So although it doesn’t necessarily make my lashes grow longer, it does make them so much more voluminous and soft, which I’ll happily take.

• Key ingredients: L-proline (strengthens); hyaluronic acid, aloe vera (hydrating); isopropyl cloprostenate (prostaglandin analog that can possibly help thicken lashes)
• Application frequency: Once a day
• Size: 0.03 fl oz

Glowing customer review: “I accidentally ripped out my eyelashes with an eyelash curler. I decided to try this to see if it would help. This is the longest my lashes have ever been. I rarely lose any lashes when removing my waterproof mascara.”

Prostaglandin analogs, which are found in popular serums like GrandeLash and RapidLash, are great for potentially thickening your lashes, but they can def come with some side effects (like itchy, red eyes; sensitivity; and darkening of your eyelids, which happened to me). But Olaplex’s eyelash serum actually uses a bond-building ingredient instead to help thicken and strengthen my lashes. It helps rebuild the bonds in my lashes to make them stronger and less prone to hair fall, which inevitably makes them look thicker over time. After lining my upper lid with this serum twice a day for three months, my lashes feel ultra-soft too.

• Key ingredients: Bis-aminopropyl diglycol dimaleate (bond-building), peptides (strengthening)
• Application frequency: Twice a day
• Size: 0.15 fl oz

Glowing customer review: “I’m very sensitive and find this to be gentle. It doesn’t burn at all! I’ve been using It for two weeks, and It says you have to use it for four, which is the average lash cycle, to really see a difference. I do think my lashes are looking thicker and longer already though.”

Latisse is currently the only eyelash serum FDA-approved for lash growth. It’s formulated with an active ingredient called bimatoprost, a prescription-only prostaglandin analog that helps grow your existing lashes and stimulate the growth of new hairs in four to six weeks. But keep in mind: It’s pretty strong, so make sure to discuss the potential risks—like eye irritation, eye-color change, and eyelid-darkening—with your doctor beforehand, says ophthalmologist Nicky Shah, MD.

• Key ingredients: Bimatoprost (prostaglandin analog that can help grow lashes)
• Application frequency: Once a day
• Size: 0.17 fl oz

Glowing customer review: “If you’ve lived with short, stubby, blonde lashes your whole life, then this is worth the splurge. I use less mascara, and I feel more confident. Love it.”

FYI: Sydney Sweeney says she ordered this lash serum after seeing it on TikTok (Celebs! They’re just like us!), and said that makeup artists don’t even put false lashes on her anymore because her lashes have gotten so voluminous and fluttery. The serum contains isopropyl cloprostenate (a synthetic prostaglandin analog) that can help lengthen the growth phase of your lashes, along with conditioners like peptides, hyaluronic acid, soybean oil, and biotin for softer and healthier lids and eyelashes. And it's frequently on sale, so win-win.

• Key ingredients: Peptides, hyaluronic acid, soybean oil, biotin (moisturizers); isopropyl cloprostenate (prostaglandin analog that can possibly help thicken lashes)
• Application frequency: Once a day
• Size: 0.1 fl oz

Glowing customer review: “THIS IS INCREDIBLE. My daughter has a terrible anxiety issue and was pulling her eyelashes out. I ordered this thinking it would take a couple months to fill in. In a couple weeks, it looked like she was wearing false lashes. You would never know!”

If your eyelashes feel brittle and stiff, grab this super-moisturizing lash serum from Obagi, which is loved by dermatologist Mona Gohara, MD. It’s packed with hydrators—like hyaluronic acid, panthenol, and biotin—which won’t necessarily make your lashes grow longer but can make them feel softer, and in turn, potentially look thicker. Plus, if your eyelids are naturally dry, you’ll get a light moisturizing effect too.

• Key ingredients: Biotin, panthenol, hyaluronic acid (hydrating); dehydrolatanoprost (prostaglandin analog that can possibly help thicken lashes)
• Application frequency: Once a day
• Size: 0.1 fl oz

Glowing customer review: “I recently stopped getting lash extensions after seven years. Needless to say, my natural lashes needed some TLC. I started using this a little over a month ago and can already tell a difference, especially in the thickness of my lashes.”

Not ready to invest in a high-end lash growth serum? You can still work toward longer, stronger lashes with The Ordinary's Lash and Brow Duo Multi-Peptide Serum, which is packed with an array of peptides said to support lash health. Perk alert: The product can be used on both your eyelashes and eyebrows, so this two-pack is perfect for germaphobes (like moi) who don't want to use the same brush for both.

• Key ingredients: Trifolium pratense flower extract (supports hair density and thickness), Acetyl Tetrapeptide-3 and Biotinoyl Tripeptide-1 (peptides)
• Application frequency: Twice a day
• Size: 0.34 fl oz

Glowing customer review: "I got it a few weeks ago, and I already notice a difference in the fullness of my brows, and I’ve been getting a lot more compliments on my lashes. The price point is amazing for such an effective product. It lasts months even while used twice a day. And it’s prostaglandin-free!"

If you can’t be bothered to add yet another step in your already laborious nighttime skincare routine (it’s me, hi), try this eyelash serum primer before swiping on your mascara. It’ll def take a few more months to see the same fullness and conditioning (unless you wear eye makeup every single day) as a typical eyelash serum but worth it for the ease, bb. It uses vegan collagen and panthenol to hydrate your lashes and prep them for mascara, which can potentially help limit some lash fall if mascara tends to clump and dry out your lashes.

• Key ingredients: Peptides, panthenol (moisturizing)
• Application frequency: Once a day
• Size: 0.24 fl oz

Glowing customer review: “Have never used primer for lashes before. Wonderfully surprised. Makes for great mascara application. I have very light, sparse lashes, and this primer gives me the foundation for full, healthy-looking lashes.”

My lashes are prone to getting crusty and dry, especially if I’ve been loading them up with too much drying mascara, or worse, forgetting to remove my eye makeup before bed. Enter: RevitaLash’s conditioning eyelash mask, which is probably the bougiest and best thing in my skincare routine. I coat my lashes with this moisturizing serum (hi, biotin, vitamin E, and trehalose—a type of sugar that helps water bind to your skin and hair) three times a week to keep them feeling soft and fluffy. Just brush it on, wait 15 minutes while it dries, then wipe it off with a warm, wet washcloth. If there’s any serum stuck in between your lashes, comb through it with the other end of the applicator to remove the excess.

• Key ingredients: Trehalose, biotin, vitamin E (moisturizers)
• Application frequency: Once a day
• Size: 0.17 fl oz

Glowing customer review: "I use this twice a week. It really does revitalize your lashes and brows. With all the makeup we use throughout our lives (I’m 72) Revitalash has kept my lashes and brows looking beautiful. Even if you don’t wear makeup you’ll love how it makes them look and feel."

Now that I have the thick, healthy lashes of my ~dreams~ (thanks to the eyelash serums on this list), I’m trying to avoid drying, clumpy mascaras that make my lashes fall out. Which led me to this lengthening and volumizing mascara, which actually works double-duty to help condition my lashes. It’s filled with moisturizers—like green tea extract, castor-seed oil, and jojoba oil—that help keep my lashes strong and healthy-looking.

• Key ingredients: Green tea extract, castor seed oil, and jojoba oil (moisturizing)
• Application frequency: Daily as mascara
• Size: 0.38 fl oz

Glowing customer review: “This mascara thickens my eyelashes and makes them look fuller. Great formula and applying is easy. It doesn’t smudge under my eyes either.”

If your eyelashes are constantly falling out, allow me to introduce you to this eyelash serum from Velour Lashes. It uses a combo of a whopping 13 (!) amino acids to help stimulate keratin production, which can strengthen your lashes and potentially lead to fuller eyelashes. Meaning: While you won’t see dramatic growth (once again, only Latisse can do that), this serum will keep your lashes strong to prevent breakage and further hair loss.

• Key ingredients: Sodium PCA (hydrating); arginine, alanine (strengthening)
• Application frequency: Once a day
• Size: 0.14 fl oz

Glowing customer review: “I’ve been using the serum mainly nightly for four weeks. Over this time, my lashes became stronger and healthier, they have that healthy shine now.”

I already have enough products in my bathroom (sry, roomie), so I was stoked to try this eyelash serum that I could use to help make my brows a little bushier too. It won’t make your lashes or brows necessarily longer, but it’s hella moisturizing and soothing, thanks to its aloe vera and cannabis-seed extract (which is a great anti-inflammatory, btw). Milk’s serum is also packed with peptides to help moisturize and help strengthen your lashes and brows to limit hair fall. Swipe it along your upper and lower lash lines, then draw short, hair-like strokes through your brows as the final step of your nighttime skincare routine.

• Key ingredients: Peptides (moisturizing); aloe vera, cannabis seed extract (moisturizing and soothing)
• Application frequency: Twice a day
• Size: 0.12 fl oz

Glowing customer review: “After only one week, I saw a change. I stopped getting lash extensions, and my lashes were very damaged. I used this product only at night, and my lashes are stronger, healthier.”

If you’re perusing the drugstore aisles for an eyelash serum, don’t skip over Neutrogena’s. It’s full of biotin and peptides, which doesn’t actually enhance hair growth but does add a nice coating to help your lashes appear softer and fuller. So if your lashes feel like they’re on the finer side, this moisturizing serum might give your lashes a thicker appearance for less than the cost of happy-hour drinks.

• Key ingredients: Biotin, peptides (moisturizing)
• Application frequency: Once a day
• Size: 0.08 fl oz

Glowing customer review: “I noticed that the eyelashes that I do have stopped breaking off and falling out after about a week. It truly moisturizes your upper and lower lashes so that when you remove even stubborn waterproof mascara, you don't lose eyelashes."

I’ve ripped my lashes out with an eyelash curler an embarrassing number of times, which led me to test this strengthening eyelash serum from Lancôme. It is legit packed with six amino acids that help build collagen and elastin, a key to healthy lash growth, and helps condition ’em too. It’s made my eyelashes so much stronger, which has led to thicker-looking lashes because I don’t lose as much hair simply wiping off my tubing mascara or gently pulling off magnetic eyelashes.

• Key ingredients: Threonine, arginine, serine (strengthening)
• Application frequency: Twice a day
• Size: 0.13 fl oz

Glowing customer review: "My lashes are already very fine and quite blonde, so I need every single one. This formula has helped me SO MUCH that I actually can’t imagine life without it now! My lashes are fortified and strong where I don’t see a single lash on my makeup remover towel! My lashes are looking thicker than ever too.”

Developed by opthalmologist Nicky Shah, MD, this eyelash serum is actually meant to be smeared all over your eyelids, because it’s straight-up filled with ingredients to help soothe and hydrate both your skin and lashes. White willow bark extract, turmeric-root extract, and black-cumin oil all have anti-inflammatory properties, says Dr. Shah, noting that soothed skin is important for hair growth. “When you decrease inflammation in the oil glands of your lash line, your lashes will be healthier and, in turn, grow,” she says.

• Key ingredients: White willow bark extract, turmeric root extract, black-cumin oil (soothing)
• Application frequency: Once a day
• Size: 0.07 fl oz

Glowing customer review: “I’ve been using this for a few months now, and it has kept up the length of my lashes, so I’d say it works as well as the lash serum I used previously but without the side effects. I started off using it daily, and now just use it a few times a week and haven't noticed my lashes weakening or reverting to what they were before. I would highly recommend it!”

If liquid eyeliner is part of your regular makeup routine, give your lashes a big boost by switching to Physicians Formula's Eye Booster liquid liner, a two-in-one eyelash serum and eyeliner that'll help ensure you don't miss a single daily treatment. Formulated with hypoallergenic ingredients, it's safe for those with sensitive skin to apply right along the lash line. Added bonus: It comes in both black and brown!

• Key ingredients: Myristoyl pentapeptide-17 (a peptide that can help boost keratin production), glycerin (moisturizing)
• Application frequency: Daily as eyeliner
• Size: 0.01 fl oz

Glowing customer review: "I have used many eyeliners in my life and this one is by far the best one. Application is smooth and even. Lasts the entire day without even a smudge! Comes off so easily with micellar wipes at night. I would give this product six stars if I could!"