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The only thing that tests our patience more than growing out bangs is growing out our eyebrows. Whether you're a recovering over-plucker or simply looking for a bushier shape, reaching your maximum brow potential requires a tedious and frustrating grow-out process. But a killer brow growth serum can certainly help speed things along. Now, before you get too excited, know this: Nothing will make those hairs grow overnight. Dermatologist Matthew Lin, MD, tells us that the most effective boosters — like minoxidil or bimataprost (which is the main ingredient in Latisse) — require a prescription. He also notes that there could be an underlying reason why your brows aren't growing, like an autoimmune disease or alopecia, which require a physician's supervision. But if that's not the case, you don't necessarily need a doctor's note to give your brows some extra TLC. Dr. Lin says there are plenty of over-the-counter ingredients — like biotin, hyaluronic acid, ricinoleic acid, and keratin — that help improve the quality and structure of hair. But the brow growth serums online or in the drugstore, don't actually make your hair grow as much as they condition and prime hair for growth. So at the very least, your brows will look and feel healthier — even if they're still a little sparse. With so many brow serums out there claiming to give you Cara Delevingne-level arches, we asked brow pros for the hair treatments they actually give to their over-plucked celebrity clients. Check out their picks, and get advice from the experts, ahead. At Refinery29, we’re here to help you navigate this overwhelming world of stuff. All of our market picks are independently selected and curated by the editorial team. If you buy something we link to on our site, Refinery29 may earn commission. Castor oil has long been hailed as the best and cheapest solution to growing full, lush eyebrows. But make no mistake: It won't grow your brows or even accelerate the process. What it will do is prime the hairs, so they're in the best condition to grow. "Castor oil contains ricinoleic acid, which is rich in antioxidants," explains Dr. Lin. "This may improve quality of hair by supporting the keratin in the hair shaft." Still, don't be surprised if you hear a pro sing castor oil's praises. In fact, London-based brow expert Suman Jalaf, celeb brow artist Giselle Soto, and makeup artist Daniel Chinchilla of Chinchilla Brow s all swear by the stuff. Heritage Store Castor Oil, $13.23, available at AmazonPeople often engage in off-label use of lash serums, putting them on their brows as well, and Dr. Lin says that it's generally considered safe. If you take a closer look at both the aforementioned products, you'll see that their ingredient lists are nearly identical. The two key names to look out for: ginseng extract and glycosaminoglycans, which have both been proven to stimulate growth in the hair follicle in previous studies. Makeup artist William Scott suggests GrandeLASH to clients with thinning brows, while Soto and makeup artist Stevi Christine prefer the brand's brow-specific serum instead. Grande Cosmetics GrandeBROW Brow Enhancing Serum, $70, available at SephoraKristie Streicher, Hollywood brow artist and co-owner of Striiike salon, recommends RevitaBrow to her clients. Not only does it include ginseng and biotin, but it's also packed with panthenol, which promotes thicker hair growth. Streicher stresses that consistency is key with all growth serums and to expect visible results after about six weeks of daily use. RevitaLash RevitaBrow Advanced Eyebrow Conditioner, $110, available at DermStoreLike Scott, Chinchilla is a fan of using a lash serum on the brows. His go-to: Shiseido's Full Lash Serum. "This product is full of hydrating technology that prevents brows from looking sparse and thin," he explains. The serum's hero ingredient: arginine, which Dr. Lin confirms has been used as a hair growth stimulant (though it's lacking in robust research evidence). Shiseido Full Lash and Brow Serum, $35, available at SephoraChristine suggests that anyone looking to hit fast-forward on the growth process should try Neubrow — especially if you're looking for a deeper tint. The formula darkens hairs while the biotin and keratin strengthen and smooth. neuLash neuBrow Brow Enhancing Serum, $100, available at DermStoreRapidLash's brow serum also includes keratin and biotin as its main ingredients. This serum is swept through the hair with a wand instead of a brush, making precise, full-coverage application a bit easier. Rapid Lash Eyebrow Enhancing Serum, $39.99, available at Ulta BeautyIn addition to the brow growth serum (which is pretty great), BrowFood has an entire line of products — from pencils to powders to gels — that simultaneously treat and tame brows. The line swaps out some of the harsher chemical growth stimulants for adenosine, which has been proven to have similar effects as topical minoxidil. In fact, one study found that patients preferred the fast evidence of adenosine over that of minoxidil. LashFood BROWFOOD Phyto-Medic Eyebrow Enhancing Serum, $90, available at LashFoodLike what you see? How about some more R29 goodness, right here? The Best Quick-Fix Spot Treatments To Clear Up Pimples — Starting At $5 These $10 Waxing Strips Will Convince You To Toss Your Razor The Ordinary Is Officially Back In Stock At Sephora