13 Best Eyelash Growth Serums 2026, Reviewed by Experts
If there’s one thing I’ve learned after years of testing beauty products, it’s that the best eyelash growth serums deserve far more credit than they get. I used to believe nothing could help my lashes after a decade of lash extensions and false lashes had left them short, frail and sparse. I tried every DIY hack under the sun, from drenching them in castor and rosemary oil to skipping mascara, and the only result I got? Greasy lids.
Still, being a beauty journalist means trying everything, whether it’s the best mascaras, the best hair serums, or the best red light therapy hair growth devices – and that includes lash serums. So, in the name of research, I decided to properly test a few and speak to the experts.
According to Claire Larsen, global master educator at RevitaLash Cosmetics, “Eyelash serums are similar to a hair conditioner: they hydrate the hair with conditioning ingredients for shine and flexibility, to prevent brittleness and breakage, and they strengthen the hair with ingredients rich in vitamins and strengthening peptides.” Suddenly, it made sense – treating your lashes like hair rather than makeup might actually be the secret.
After just three weeks of using a certain eyelash serum, I could barely recognise my own lashes. They looked darker, fuller, and noticeably longer – something I could never achieve before (even after trying alternative remedies like castor oil or rosemary oil).
And I’m not the only one who’s seen real results. Shani Cohen, Glamour’s Beauty Commerce Writer, swears by the UKLASH Complex Peptide Serum: “I used it every night before my wedding and by week five, people were asking if I’d had extensions.” When a lash serum has that effect, you take note.
So, whether you’re looking to educate yourself some more on all the benefits and potential side effects of lash serums, or if you’re already hovering over the ‘add to basket’ button, we’re here to help.
Your eyelash serum questions, answered…
How I Tested & Why You Can Trust Us:
I’ve been testing beauty products professionally for almost six years now, which means I’ve tried pretty much every lash serum to land on a beauty desk – from cult classics like RapidLash to newer formulas from UKLASH. Over that time, I’ve learned one very important thing: every lash serum is different. What works wonders for one person might do nothing for another, which is why I always test a wide mix of formulas – some packed with peptides, others with biotin, panthenol or castor oil – to see what really delivers results.
Each product gets a proper trial run of at least four to six weeks (lashes take time, unfortunately). During testing, I avoid any other lash-enhancing treatments or supplements, so I can see exactly what the serum is doing on its own. I also pay attention to how my eyes react – if something stings, burns or causes redness, it’s immediately ruled out.
Because I’ve spent years speaking with dermatologists, makeup artists and trichologists, I know what to look for in a formula – and what’s just marketing fluff. I also look at price tags too – some of the best results I’ve had come from mid-range serums, not the over £100 options. So when I say a lash serum works, it’s because it genuinely does – not because it looks pretty on my shelf.
What is the best eyelash serum that actually works?
Total honesty: it’s a toss-up between the two. RevitaLash is a brand behind one of the most popular eyelash enhancers on the market – the RevitaLash Advanced Eyelash Serum – largely due to its ability to target hair growth whilst defending against environmental damage. It has an antioxidant-packed green tea and the BioPeptin complex, and has genuinely delivered on results when tested by multiple members of the Glamour team.
Our former Senior Visual Editor, Chelsea Hughes, gave the product a particularly glowing review after testing it over the course of six weeks.
“To sum this product up; I’ve had numerous friends and family physically inspect my lashes to check whether or not I’m lying about them being real,” she said. “The improvement is phe-nom-en-al!”
Our runner-up? Glow For It lash serum. It’s a vegan, cruelty-free formula (not all lash serums are), which is formulated to give healthier, thicker, fuller, longer lashes. It’s enriched with peptides, which work to stimulate the lash follicle for visible results after just a couple of weeks – without irritating the eyes. It also features an ingredient called saw palmetto extract, which helps to lessen sparsity and helps with thicker growth. TikTok, you were right to go wild for it.