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2021's Top Lash Serums for Longer, Fuller-Looking Lashes

Master Cosmetologist shares what to look for in a lash serum that delivers results + see our top 5 picks.

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Every woman knows the difference long, full lashes can make to our appearance. And while "glue-ons" may look great in the moment, wouldn’t we all prefer to grow our own stunning natural lashes?

Lash serums offer a long-term solution for women who want to help their natural lashes flourish—and break free from the constant falsies, extensions, and heavy mascara.

“Using a high-quality lash serum will actually help you (support) your own longer, thicker, denser-looking lashes so that you don’t have to use those quick fixes anymore," says Master Cosmetologist Beverley Simmons. 

But, with so many empty promises in the cosmetics industry, it’s hard to know which lash serums will deliver visibly longer, thicker lashes... and which will leave you disappointed. That’s why Smarter Reviews has compiled the available research and narrowed it down to the top 5 quality lash serums that deliver results.

What To Expect From A Quality Lash Serum

Month 1

If you look closely at your lashes, you may begin to notice a  visible difference in their length and volume. However, be wary of companies claiming to deliver dramatically longer lashes in a single month. Significant, visible changes to the lashes take time.

Month 2

After a couple months of nourishing the natural lash growth cycle, many people notice their overall lash line looks denser. You may also find that you don’t need as much mascara, now that your lashes are visibly longer and thicker.

Month 3

This is when many women report seeing a “night and day” difference in the appearance of their lashes. So, if you want to experience the full effect of a lash serum, we recommend sticking with your new lash serum for at least three months.

However, consumers should be aware that many lash serums fall short of these results.“Some of the lash serums that are on the market today—the lower quality ones—they're not effective," says Beverley Simmons.

"You're not getting those longer, thicker, denser-looking lashes that you're really looking for because it doesn't have enough of the quality ingredients that you need,” adds Simmons. Look for the following ingredients to ensure a lash serum can back up its claims:

Key Ingredients in a High-Quality Lash Serum  

Peptides

Peptides are unique chains of amino acids that promote visibly longer, fuller lashes. We recommend Acetyl Tetrapeptide (CapixylTM) and Biotinoyl Tripeptide (WideLashTMbecause both were shown to be effective in scientific studies. 

Red Clover Extract

This scientifically backed botanical was shown to support longer, thicker-looking lashes when combined with peptides.

Hydrolyzed Keratin

Keratin is the main protein in our lashes that keeps them looking thick and strong. Hydrolyzed keratin is a new, shrunken-down form that is small enough to absorb into your lashes when applied topically.

Vitamins

Lash-supporting vitamins like Biotin and Panthenol help nourish the natural lash growth process for long, healthy-looking lash strands.

Amino Acids

Amino acids are the building blocks that make up the inner structure of your lashes. Applying them directly to your lashes can support visible lash volume and strength.

Ingredients To Avoid:

Prostaglandins

Prostaglandin analogs are hormone-like chemicals known to cause harsh side effects—including rashes, pain, hollow eyelids, and in some cases, darkening of the iris and surrounding skin, which can be permanent. Due to these risks, the FDA recently prohibited the use of prostaglandins in cosmetics. Even so, several well-known lash serums still contain these chemicals—listing them under misleading names such as "Isopropyl cloprostenate."

Parabens

Parabens are known skin irritants that can disrupt healthy hormone function in large amounts—resulting in common side effects. Lash serums that do contain parabens may not openly disclose it on the label. So, always look for lash products that say "paraben-free."

What Else to Consider When Buying a Lash Serum

Clinically Studied Ingredients

The only way to verify that an ingredient produces longer, thicker-looking lashes is to test it on real people—in a clinical study. That's why we recommend finding a serum that contains clinically studied ingredients. “With more of those clinically tested ingredients, your chances of having better results go up exponentially,” explains Beverley Simmons.

Money-Back Guarantee

The beauty industry makes billions of dollars per year, which makes it easy for manufacturers with poor products to slip through the cracks. So make sure to get a lash serum from a brand that’s willing to stand by its product with a 100% money-back guarantee.

Top 5 Lash Serums Of 2021

When putting together our rankings, we consider the quality of ingredients, safety, return policies, projected effectiveness, and customer satisfaction.

1. Lash24TM AM/PM Formula

Total Ranking

9.7/10

A+

Overall Grade

PROS

  • PM Lash Serum + AM Primer
  • 3 clinically studied ingredients
  • 2-month supply
  • Naturally derived ingredients
  • Acetyl Tetrapeptide 
  • Biotinoyl Tripeptide
  • Red clover extract
  • Silk amino acids
  • Hydrolyzed keratin
  • Biotin & panthenol
  • Prostaglandin-free
  • Paraben-free
  • 90-day return policy

CONS

  • Exclusively sold in the US
  • Only available online
The Bottom Line

Hair La Vie's Lash24 contains three clinically studied lash ingredients. The formula also features two naturally derived peptides, silk amino acids, hydrolyzed keratin, biotin, and panthenol.

To top it all off, Lash24 is the first product of its kind to have dual purpose AM primer + PM serum formulas. Each tube contains 8ml of product, which should last around 2 months—this is almost 3x more than the other brands on our list. 

Users of Lash24 reported longer, fuller-looking lashes within as little as 6-8 weeks. Hair La Vie also offers a 100% satisfaction, 90-day money-back guarantee, which shows us that they stand by their product.

*Results are based on the Smarter Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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2. Lunar Lash 

Total Ranking

9.1/10

A-

Overall Grade

PROS

  • 3 clinically studied ingredients
  • Naturally derived formula
  • Acetyl Tetrapeptide
  • Biotinoyl Tripeptide
  • Red clover extract
  • Amino acids
  • Hydrolyzed keratin
  • Biotin & Panthenol
  • Prostaglandin-free
  • Paraben-free
  • 60-day return policy

CONS

  • 3ml of product per tube
  • Only for nighttime use
The Bottom Line

Lunar Lash by Tru Alchemy ranks #2 on our list of top five lash serums. This PM lash serum delivers potent conditioners to help maintain hydration and support a longer, fuller look.


Lunar Lash is formulated with three clinically studied ingredients, including two peptides. It also contains clean ingredients like amino acids, hydrolyzed keratin, biotin, and panthenol that work to visibly improve lash length and volume.

Plus, Tru Alchemy’s risk-free return policy includes a 60-day, no-questions-asked guarantee. It may not be needed, however, as the effectiveness of the product earned a top score.*

*Results are based on the Smarter Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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3. Gro+ Advanced Lash Serum 

Total Ranking

8.7/10

B+

Overall Grade

PROS

  • 1 clinically studied ingredient
  • Naturally derived ingredients
  • Acetyl Tetrapeptide
  • CBD, red clover, and mung bean extract
  • Prostaglandin-free
  • Paraben-free
  • 90-day return policy

CONS

  • Only 3ml of product per tube
  • Can only be used at night
  • Lacks hydrolyzed keratin and biotin
  • Lacks amino acid complex
The Bottom Line

There's a lot to like about GRO+ Advanced Lash Serum by Vegamour. Like most contenders on our list, this serum is made with naturally derived ingredients, and is 100% vegan and cruelty-free

In addition to a clinically studied peptide, Vegamour's formula also includes red clover, mung bean, and hemp-derived cannabidiol, which has been shown to help support blood circulation.

Unfortunately, it lacks essential nutrients like keratin, biotin, and an amino acid complex. Their tube only contains 3ml of product and can only be used at night.

On the plus side, people who used this product left highly favorable reviews, and many people found it to be an effective lash serum. Additionally, Vegamour offers a solid 90-day money-back guarantee

*Results are based on the Smarter Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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4. GrandeLASH-MD


Total Ranking

8.1/10

B-

Overall Grade

PROS

  • Panthenol
  • Comprehensive amino acid complex
  • Glycosaminoglycans
  • Paraben-free
  • 90-day return policy

CONS

  • Only 4ml of product
  • Can only be used at night
  • Lacks peptides, keratin, and biotin
  • Contains prostaglandin analog
The Bottom Line

GrandeLASH-MD's award-winning lash serum is infused with a potent blend of ingredients to help promote the appearance of longer, thicker lashes. Its formula includes panthenol, amino acids, and other lash-supporting ingredients

However, it's also missing a lot of key ingredients: peptides, biotin, and hydrolyzed keratin. And unfortunately, GrandeLASH-MD's formula contains a prostaglandin analog, which may be responsible for some users reporting discoloration around their eyes after use. 

Their formula comes in 2 different sizes, the larger containing 4ml of product, which still falls short of our top pick. Plus, it's only a night time serum. Grande Cosmetics offers a 90-day return policy if you're not 100% satisfied with their product or experience adverse side effects. 

*Results are based on the Smarter Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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5. Lash Boost


Total Ranking

7.5/10

C

Overall Grade


PROS

  • 2 peptides
  • Hydrolyzed keratin, panthenol, and biotin
  • 5ml of product
  • 60-Day Guarantee
  • Paraben-free 

CONS

  • Can only be used at night
  • Lacks several key ingredients
  • Contains a prostaglandin analog 
  • High price point at $155
The Bottom Line

Rounding out our list is Rodan + Fields Lash Boost. Their formula includes favorites like panthenol, keratin, and biotin. However, it's missing other important ingredients like peptides and amino acids

More importantly, Rodan + Fields recently came under fire for "deceptive labeling" and a lawsuit was filed on behalf of consumers, alleging a "failure to disclose the harmful side effects" of a prostaglandin analog in their formula

Additionally, Rodan + Fields Lash Boost costs $155, which is 2-3 times as much as the average eyelash serum. On the upside, it does contain 5ml of product per tube. And if you're not satisfied with this product, Rodan + Fields offers a 60-day money-back guarantee

*Results are based on the Smarter Reviews Ranking System and do not necessarily reflect typical results from the use of these products. Please visit product websites for more information.

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CITATIONS

  1. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3036812/
  2. Karaca and Akpolat, J Cosmo Trichol 2019, 5:1 DOI: 10.4172/2471-9323.1000140
  3. https://pubmed.ncbi.nlm.nih.gov/23449130/
  4. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3509882/
  5. https://pubmed.ncbi.nlm.nih.gov/28879195/
  6. https://www.researchgate.net/figure/Hyaluronic-acid-filling-in-the-left-temple-region-results-in-the-skin-necrotic-and_fig6_328647283
  7. https://www.agelyss.com/downloads/widelash.pdf
  8. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6147748/
  9. https://www.yourhormones.info/hormones/prostaglandins/
  10. https://krcomplexlit.com/currentcases/rodan-fields-lash-boost-litigation