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During the pandemic, my best friend started coating her lashes every single night with an eyelash serum, and as a beauty editor, I couldn’t help but be…skeptical (though, to be fair, I’ve tried laser-hair removal, microneedling, microblading, and EmSculpt in the past, so who was I to talk?). But to my surprise, her lashes ended up looking noticeably thicker after a few months, to the point where a stranger literally asked where she got her eyelash extensions done. Cut to me, years later, being a full lash-serum convert who, since then, has tested more than a dozen eyelash serums to figure out the formulas that actually work—and the formulas that seriously suck.
But before I get anyone’s hopes up, know this: No over-the-counter lash serum can actually grow your lashes longer (only prescription formulas can; more on that below). But depending on their ingredients, some eyelash serums can make your lashes thicker and less prone to falling out. So to help you choose the best formula, I got all the deets from two ophthalmologists as well as a dermatologist. But before we get there, here’s a peek of the absolute best eyelash serums I’ve tested, including Sydney Sweeney’s favorite for thicker lashes:
Grande Cosmetics GrandeLASH-MD Lash Enhancing Serum – Best Eyelash Serum Overall
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.”
RapidLash Eyelash-Enhancing Serum – Best Thickening Eyelash Serum
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!”
Obagi Medical Nu-Cil Eyelash-Enhancing Serum – Best Eyelash Serum for Dry Lashes
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.”
RevitaLash Cosmetics Lash & Brow Masque – Best Conditioning Eyelash Serum
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.”