Nez Hasan is a London-based celebrity eyebrow specialist and founder of Hairgredients, a line that harnesses naturally-derived ingredients for eyebrow growth. This premium growth serum might fall at the higher end of your budget, but it aced our lab test for volumising and lengthening lashes.

How to Apply: According to Augustinus Bader, this serum is best applied morning and night. Just coat your brow hairs evenly with the wide side of the bristle applicator. Created by celebrity lash and brow expert Sarah Maxwell, this dual eyebrow and lash growth serum is a powerhouse of hair-boosting vegan ingredients that are clinically proven. One of the main ingredients is nigella sativa that contains the essential amino acids your lashes and brows need to grow. What’s more, each bottle contains a six-month-supply, but the beauty maven says that you should see results within just four weeks. We’ve started using this ourselves and love how easy it is to apply and how nice it feels on the eyebrows and lashes.

Do brow serums actually work?

In a bid to find a growth serum that really works, we asked our panel of beauty testers to put a range of market-leading products to the test for two months. These seven earned their seal of approval: View On Myshopify.com View On Positivelybeautifulboutique.com View On Simplyyouboutique.com Why We Like It Why We Love It: Another top-rated formula, LiLash contains a blend of vegan, natural, paraben-free ingredients. “In addition to panthenol, this formula contains biotin, which can help foster healthy hair growth—especially if you’re biotin deficient,” says Hilal-Campo. It also includes hydrolyzed lupine proteins. “Lupine is rich in fatty acids and amino acids, and is known to help nourish hair,” she adds.

This formula contains SYMPEPTIDE XLASH® complex (with Myristoyl Pentapeptide-17), Anargy® complex (with Oligopeptide-2 and Glycoproteins), Widelash™ complex (with Biotinoyl Tripeptide-1 and Panthenol), REDENSYL™ complex (with Larix Europaea Wood Extract, Camellia Sinensis Leaf Extract, and Zinc Chloride), CAPIXYL™ complex (Acetyl Tetrapeptide-3 and Trifolium Pratense Flower Extract), and High-Solubility Caffeine. Joey Healy is a celebrity brow specialist. Known for his trendsetting vision and amazing technical skill, Healy is one of the most influential and sought-after eyebrow specialists in the industry. With his skill for crafting the ideal arch, Joey launched his eyebrow empire in 2010 with his signature product line, Joey Healy Eyebrow Collection, following in 2011. In 2012 Joey opened his flagship Fifth Avenue Joey Healy Eyebrow Studio, a stylish eyebrow sanctuary for his jet-setting, unisex clientele. With his popularity rapidly growing, Joey expanded with a new team of brow proteges to a larger NYC location in 2015. Results: Covergirl states that this serum is clinically proven to enhance the look of your lashes and brows in just 30 days Why We Love It: “Castor oil can be a great, natural way to grow your eyelashes,” says plastic surgeon Dr. Kevin Sadati. “Castor oil is widely used and regarded as a safe alternative to medical actives—but like any other products, make sure it stays out of your eyes.” He also provides a pro tip: “Because it’s an oil, it generally isn’t safe to use with eyelash extensions.”Dr. King recommends Maya Chia Power Fol Eyelash and Eyebrow Growth Serum for people with eczema because it’s gentle yet showed promising results in a small consumer study. The formula contains a complex of four peptide ingredients and botanical extracts. This lightweight, non-greasy product did well in our lab test, managing to improve lash volume by 8% over an eight week period. Ready to ditch mascara for good? To get those long, voluminous eyelashes and healthy-looking eyebrows that you envy, add a good lash and brow serum to your beauty shopping list. Here's the deal: If a product is "able to claim hair growth, it would have to be regulated as a drug by the Food and Drug Administration," says Good Housekeeping Institute Beauty Lab Executive Director Birnur Aral, Ph.D. Currently, the only ingredients proven to be effective at stimulating the growth of new hair that are approved by the FDA are bimatoprost and minoxidil. Bimatoprost is the active ingredient in prescription-only eyelash growth serum Latisse, while minoxidil is the active ingredient in over-the-counter topical treatment Rogaine. While there is evidence that both bimatoprost and minoxidil are effective in growing eyebrow hair, neither ingredient is currently FDA-approved for eyebrows (Latisse is only FDA-approved for eyelashes; minoxidil is the only OTC ingredient approved by the FDA for head hair growth). So, if you're interested in using either of these ingredients on your eyebrows, you'll want to consult your doctor before doing so. Dr. Melanie Palm is a San Diego–based, board-certified dermatologist, fellowship-trained dermatologic cosmetic surgeon, and founder of Art of Skin MD.