Whoa: One of the Best Eyelash Growth Serums We Tried Doubled the Length of Our Tester's Lashes in a Month

There were several perks of this lash serum from E.l.f.: Its skinny brush was easy to swipe along our lashlines, the formula fully absorbed in just one minute (without dripping or gooping), and our makeup wore flawlessly on top of the product. At just $8, this drugstore serum worked just as well as the more expensive products we once favored, and in a matter of two weeks, we noticed fuller, thicker fringe that rivaled the look of our false eyelashes.

The formula was gentle enough that even when a bit of serum ended up in our eyes, we didn’t experience any redness, irritation, or burning — a huge perk for beginners. This little tube is a quarter of the price of our old favorites, and we find ourselves reaching for this one every day now. 

Key ingredients: Glycerin, camellia sinensis leaf extract, castor seed oil | Size: 0.12 ounces | Application frequency: Morning and night

This pick from Maybelline is made with a bristled wand that applies like a mascara — making it super user-friendly. We loved how glossy and luscious this serum made our lashes look as we swiped it on and we noticed a visible change in the volume of our lashes after 10 weeks.

Its formula, made from arginine (a protein-building amino acid) and pro-vitamin B5, helps strengthen your lashes and keeps them from becoming brittle, which is great for people who routinely use lash curlers. Just make sure to wipe the excess product off before swiping it on, because the wand can get a little goopy.

Key Ingredients: Arginine, pro-vitamin B5 | Size: 0.18 ounces | Application frequency: Morning and night

Editor’s Note: This was our best overall lash serum for almost two years until September 2024, when new products were tested.

We weren’t sure what to expect when we started using this growth serum that Meghan Markle once swore by, but it soon became the one that we recommended to everyone if they wanted to invest in a high-quality product.

To our surprise, we noticed eyebrow-touching lash growth in just one month that had friends stopping us to ask if we got extensions (let us preface that this never happened before). Its thin formula feels like water and dries quickly, leaving the conditioning components to soak into our lash follicles and stimulate gradual growth. Though we were applying this serum once per day for 10 weeks, we saw our lashes nearly double in length over the course of just a month, all the while becoming thicker and less brittle as a result. The price is high, but this product delivers on its return, so it’s worth every penny.

Key Ingredients: Biopeptin complex, ginseng, swertia japonica, saw palmetto, amino acids, B vitamins | Size: 0.67 ounces | Application frequency: Once daily (morning or night)

Full of powerhouse ingredients like peptides, amino acids, and hyaluronic acid, this made quick work of our hair follicles — drying down within 20 seconds and giving us thicker strands within ten weeks. We saw a noticeable difference in the volume of our eyebrow hairs specifically, and our lashes looked and felt stronger (though there was less of a lengthening effect here).

However, when excess serum got into the corners of our eyes, it did sting a bit. We advise you to be sparing with the serum and avoid eye contact. The product’s instructions advise to swipe on the serum above your lashes like a liquid liner instead of applying it directly onto your lashes.

Key Ingredients: Amino acids, hyaluronic acid, grape seed extract, honey, aloe vera extract | Size: 0.07 ounces | Application frequency: Once daily (morning or night)

The Cils Booster Lash Revitalizing Serum from Lancôme has mastered sensitive eye-safe formulas, causing zero irritation or reactions during testing (and one tester had pre-existing eczema on their eyelids, which says a lot about the gentle nature of this serum).

Its fast-drying formula doesn’t drip into the eyes and requires just one dip into the tube to glide over both eyelids, coating each lash line evenly. It worked well with our nightly routine of eye creams and other potions, and truly did lengthen and thicken our lashes over time, and we noticed far less lash loss than we did before using it. Our only qualm? We wish the tube had a flat bottom, so we could display the pretty gold product with the rest of our go-to nighttime skincare.

Key Ingredients: Amino acids, arginine, panthenol | Size: 0.13 ounces | Application frequency: Morning and night

We love a product that multitasks, which is why we love this eyelash growth serum that doubles as an anti-aging product. In fact, after several weeks of testing, we noticed a significant change in the fullness of our lashes, especially when it came to our bottom lash line. We far less eyelash fallout when removing makeup at night and loved the cooling effect as we dabbed this serum onto our eyelids before bed.

People with mature skin and younger skin alike will both benefit from this serum, whether it be for more lush strands, preventative measures, or anti-aging purposes. We just wish it came in a brush or wand format rather than a pump; it dispenses a lot and we don’t want any to go to waste.

Key Ingredients: Rhamnose, pure hyaluronic acid, volcanic water | Size: 0.51 ounces | Application frequency: Morning and night

This speedy-fast iteration from RapidLash delivered noticeable results in just a few weeks, showing visible growth faster than the competitors we tried. We loved how gentle this serum was, as our testers have sensitive eyes yet experienced zero discomfort when using this product. The super thin consistency kept it from getting clumpy or dripping into our eyes, too.

Our lashes were looking longer and growing stronger after just a few weeks of use, resulting in less lash fallout than we experienced before and lengthening our flutters significantly. While we do wish we saw a bit more thickness in our lashes after the trial period, we appreciate our now-lengthy lashes (and the speed at which we got them).

Key Ingredients: Polypeptides, biotin, panthenol, amino acids, soybean oil, pumpkin seed extract | Size: 0.10 ounces | Application frequency: Night

This fast-acting, lash-lengthening serum was a total standout among others that we tested for its quick results, gentle formula, and substantial growth. We started seeing visible results just a few weeks into testing, and our office colleagues even told us how luscious our lashes looked.

This serum was easy to use and glided onto our lids without dripping, absorbing quickly and never irritating our eyes or skin throughout the process. We noticed much less lash loss throughout the testing  period and noticed that our lashes adopted a new curl pattern being brought out in our lashes — something we’d never seen before!

Key Ingredients: Biotin, keratin, peptides, Swiss apple extract, pumpkin seed extract | Size: 0.10 ounces | Application frequency: Night