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Looking to get your hands in tip-top shape, but your nails just won’t cooperate? Using the best nail strengthener may be an effective solution for weak nails that keep breaking, splitting, or peeling. While it may be tempting to mask the issue with a fresh set of acrylics or a gel manicure, these may actually do more harm.
Nail strengtheners are formulated to strengthen brittle nails, potentially also helping nails grow faster. “Similar to hair, nails are made of dead keratin. Once they have developed, you cannot change or remodel their structure, but you can help enhance what has already been created,” explains Joshua Zeichner, M.D., a board-certified dermatologist and director of cosmetic and clinical research in dermatology at the Mount Sinai Medical Center in New York City. “Nail strengtheners can help offer protection from the environment, hydration, and form scaffold on the surface of the nails to improve their appearance and minimize breakage.”
Meet the experts: Joshua Zeichner, M.D., a board-certified dermatologist and director of cosmetic and clinical research in dermatology at the Mount Sinai Medical Center in New York City; Pooja Rambhia, M.D., board-certified dermatologist; Michele Farber, M.D., a board-certified dermatologist at Schweiger Dermatology Group in Philadelphia
“On average, fingernails grow approximately 3.0 mm per month, while toenails grow at about 1.0 mm per month. Research indicates that starting around age 25, the growth rate of nails decreases by approximately 0.5% annually,” explains Pooja Rambhia, M.D., board-certified dermatologist, who notes that there is a long list of potential causes behind weak nails or nails that won’t grow. Dr. Rambhia agrees that over-the-counter nail strengtheners, usually enriched with ingredients like keratin and biotin, may effectively protect and fortify brittle nails.
Keep reading for the best nail strengtheners recommended by dermatologists and tested by editors to get your strongest, healthiest nails yet.
Pros
- Free from formaldehyde and irritants
- Helps strengthen with protein and calcium
- Can be used alone and over or under nail polish
Cons
- Some reviewers reported packaging issues
This treatment from Nailtiques checks all the boxes for an effective nail strengthener. “Designed for soft, peeling, or splitting nails, this treatment strengthens nails without the use of formaldehyde or toluene,” says Dr. Rambhia. “It’s enriched with protein and calcium to help rebuild damaged nails.”
Key ingredients | Protein, calcium |
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Size | 0.25 fl. oz. |
Pros
- Affordable
- Offers instant (temporary) reinforcement
- Helps strengthen over time with protein
Cons
- Some reviewers said it didn't help with dry nails
This affordable option comes recommended by Michele Farber, M.D., a board-certified dermatologist at Schweiger Dermatology Group in Philadelphia, who recommends using it alone or as a base coat under your regular polish. This treatment works quickly by filling in cracks and ridges to prevent breakage and peeling. It’s also enriched with protein and antioxidants to fortify nails over time.
Key ingredients | Protein, antioxidants |
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Size | 0.45 fl. oz. |
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3
best nail strengthener for nail growth
OPI Repair Mode Bond Building Nail Serum
Pros
- Strenghtens nails and allows for growth
- Absorbs fast
- Free from formaldehyde and irritants
Cons
- Can’t be used under gel polish
This serum from OPI is another tried-and-true nail-strengthening product that I always come back to. I regularly use gel polish on my nails, so they can get a bit bendy and breakable between manicures. After just a few applications, I see a major difference in my nails—they definitely become noticeably stronger which allows them to grow longer with less breakage. It also absorbs very quickly and can be used under regular nail polish (but not gel, sadly).
Key ingredients | Keratin |
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Size | 0.3 fl. oz. |
4
best multipurpose nail strengthener
CND RESCUERXx
Pros
- Doubles as a cuticle oil
- Works to strengthen nails with keratin
- Can be used with a manicure
Cons
- Contains fragrance
I’ve truly put this product from CND to the test as I’ve been using it for the last few years on a regular basis. It’s the texture of a cuticle oil that is not only meant to be applied there but to the entire nail as well. It’s enriched with keratin to strengthen the nails and jojoba oil to help with moisture and resilience.
I use this on my nails and cuticles when I take a break between manicures and notice a difference—even just after a few days. When I have my nails done, I use it as a cuticle oil to maintain moisture and hydration and keep my manicure looking great.
Key ingredients | Keratin, jojoba oil |
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Size | 0.5 fl. oz. |
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Pros
- Dries quickly
- Can be worn under regular polish
- Enhances the appearance of natural nails
Cons
- Some reviewers note the polish chips easily when worn on its own
“I love doing my own manicures, and this has been my go-to base coat for years. It contains biotin, calcium, and vitamins which help strengthen your nails over time,” says Prevention Freelance Writer Jenn Gonick. “Plus, it dries super quickly and works great under polish so your nails still look and feel healthy after removing it. I also love swiping two coats on when I don’t have time to do my nails as it makes them look so much more put together in just a few minutes. I’ve even gotten compliments on how my nails look when I only have this on!”
Key ingredients | Biotin, calcium, vitamin A, vitamin C, vitamin E |
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Size | 0.5 fl. oz. |
Pros
- Aids with peeling nails
- Gentle formula safe for sensitive skin
- Strengthens nails with protein and vitamins
Cons
- Some reviewers say it doesn’t wear well under polish
While the original version of OPI Nail Envy is well-loved, Dr. Rambhia recommends this iteration of the formula which “is free from formaldehyde, formalin, and toluene, and is specifically designed for sensitive or peeling nails,” she explains. “It contains aloe vera and vitamins to nourish and strengthen fragile nails gently.”
Key ingredients | Protein, aloe, vitamin E, vitamin C, kukui nut oil |
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Size | 0.5 fl. oz. |
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7
best nail strengthener system
Dr. Dana Beauty Nail Renewal System
Now 23% Off
Pros
- Exfoliates, hydrates, and strengthens nails
- Helps nails recover post-acrylic or gel manicures
- Designed by an expert in nail health
Cons
- Some reviewers disliked the smell of the products
Dr. Zeichner calls this kit “the best nail strengthening product on the market” and notes that it was developed by Dana Stern, M.D., a board-certified dermatologist and leading expert in nail health. “These products use glycolic acid and a specialized delivery system to improve brittleness and strengthen the nail to enhance growth,” Dr. Zeichner explains. “The kit also contains specialized nail buffers that are not damaging to the nail plate and a hydrating cuticle moisturizer.”
It’s also a favorite of Prevention Deputy Editor Emily Goldman. “This three-step system is so easy to use and doesn’t emit major chemical odors like its competitors. I love that it comes with a buffing device to help smooth nails, and it’s packed with hydrating ingredients,” she says. “I’ve used it off and on for over a year and have definitely noticed a difference in the strength (and length!) of my nails!”
Key ingredients | Glycolic acid, aloe, coconut oil |
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Size | Glycolic Prep Nail Treatment (0.74 fl. oz.); Deep Hydrating Formula (0.17 fl. oz.) |
8
best nail strengthener for shiny nails
Manucurist Active Glow Blueberry
Pros
- Leaves a shiny finish that lasts days
- Nourishes nails with antioxidants
- Adds hydration and moisture
Cons
- May not be the most effective for very brittle nails
This multitasking polish might be the perfect pick for those looking to instantly enhance the appearance of their natural nails while nourishing and strengthening over time. “While the jury is still out on its strengthening abilities (I need to use it a bit more before my final verdict), I love the subtle tint and loads of shine it leaves on nails,” Goldman explains. “It makes for the perfect ultra-hydrating natural-looking manicure. After a few weeks of wear, I did notice my nails seemed a bit stronger. But a gel manicure soon after left me back at square one in terms of brittleness.”
Key ingredients | Antioxidants (blueberry extract), alpha hydroxy acids, sweet almond oil |
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Size | 0.5 fl. oz. |
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9
best cream nail strengthener
Onyx Professional Hard As Hoof Nail Strengthening Cream
Now 19% Off
Pros
- Nourishes and moisturizes
- Helps strengthen brittle, peeling nails
- Conditions cuticles
Cons
- Some reviewers dislike the scent
If you prefer a cream product rather than a polish, oil, or serum, look no further than this formula from Onyx Professional that features a blend of hydrating and fortifying ingredients. It contains calcium to strengthen as well as ingredients like vitamin E, glycerin, urea, coconut oil, and jojoba oil for extra nourishment. Not only does it help prevent nail brittleness, but the cream will also moisturize cuticles—something Dr. Farber appreciates in a multi-tasking product.
Key ingredients | Calcium, vitamin A, vitamin E, glycerin, urea, coconut oil, jojoba oil |
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Size | 1.0 fl. oz. |
10
best nail strengthener for instant protection
ella+mila First Aid Kiss
Pros
- Provides instant protection
- Enhances appearance of natural nails
- Can be worn underneath regular polish
Cons
- Some users found it difficult to adhere to the recommended application frequency
“Known for its ‘17-free’ formulation, this nail strengthener is free of formaldehyde, toluene, and other harsh chemicals,” Dr. Rambhia notes. “It’s a vegan and cruelty-free option that helps fortify weak nails and prevent breakage.” The polish provides instant protection along with a healthy, shiny appearance and is designed to be reapplied every seven days for the first two weeks. Then, weeks three and four, swipe on one coat every other day. Remove at the end of the second day using a non-acetone remover before reapplying.
Key ingredients | Vitamin E |
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Size | 0.45 fl. oz. |
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11
best nail strengthener base coat and top coat
deborah lippmann Hard Rock
Pros
- Can be used as a base coat and/or topcoat
- Provides a protective layer
- Contains biotin and protein
Cons
- Pricey
“This dual-use hardener works as both a top and base coat,” explains Dr. Rambhia. “It provides a hard, protective layer that helps reduce nail splitting and chipping while also nourishing the nail bed.” Dr. Rambhia also appreciates that the formula is free of formaldehyde, toluene, and DBP to avoid irritation and further weakening of the nails.
Key ingredients | Biotin, vitamin B5, protein, diamond powder |
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Size | 0.5 fl. oz. |
12
best nail strengthener for sensitive skin
Sally Hansen Good. Kind. Pure. Vegan Nail Hardener
Pros
- Contains calcium
- Works to improve the look of ridges in the nail
- Suitable for sensitive skin
Cons
- Some reviewers say it takes a long time to dry
Dr. Rambhia is also a fan of this “plant-based option” from Sally Hansen, noting that the nail hardener is free from formaldehyde, formalin, toluene, and other harsh chemicals. “It’s formulated with natural ingredients, making it a gentle yet effective option to improve nail strength,” she explains. While the hardener can be worn alone, it also performs well as a base coat when paired with the rest of the Good. Kind. Pure. line which includes several color polishes, a top coat, and oil.
Key ingredients | Calcium |
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Size | 0.33 fl. oz. |
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How to choose and use the best nail strengthener
✔️Choose effective ingredients. Before selecting a product, scan the label for key ingredients. Dr. Farber recommends looking for collagen and protein, as these are the building blocks of nail growth. Dr. Rahmbia adds that keratin, biotin, and calcium are also great ingredients to look for as they “reinforce nail structure and promote thickness.”
✔️Focus on hydration. “Using other hydrators like cuticle oil can also improve nail repair,” says Dr. Farber. When your nails are dry, they become brittle. Hydrated nails, however, are less likely to crack and break. Before you purchase, check the label for nourishing ingredients like glycerin, jojoba oil, and vitamin E “to prevent brittleness by maintaining hydration,” says Dr. Rahmbia.
✔️Avoid harsh formulas. Dr. Rambhia suggests avoiding products that contain formaldehyde or formalin, which may temporarily harden nails but with prolonged use can actually lead to increased brittleness and damage to the nails. “Another ingredient to avoid in nail hardeners is toluene sulfonamide, often found in certain nail polishes and hardeners,” she adds. “While it can help adhesion, it may cause allergic reactions and irritation in sensitive individuals. Additionally, repeated use can lead to nail dryness, which contributes to brittleness.”
✔️Consistency is key. “Apply a nail strengthener once a week,” says Dr. Farber. “Ideally, you’ll use it on its own or underneath polish as a base coat to protect the nail from polish and polish remover.” When in doubt, follow the product’s directions.
What is the most effective nail strengthener?
Experts agree that the most effective nail strengthener is one that contains fortifying ingredients like keratin, biotin, or calcium—as well as moisturizing agents to reduce dryness and brittleness. The best nail strengthener will also not contain harsh ingredients like formaldehyde or formalin, which may provide instant gratification but lead to more damage in the long term.
With these considerations in mind, we think the most effective nail strengthener is Nailtiques’ Formula 2 Plus Treatment, which checks all the boxes above and is easily available on Amazon.
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Do nail strengtheners actually work?
“Over-the-counter nail strengtheners can effectively protect and strengthen brittle or damaged nails,” says Dr. Rambhia, noting that these products typically contain ingredients like keratin and biotin, “which reinforce nail structure and enhance thickness.”
“Nail strengtheners work by crosslinking keratin, the primary building block of nails, thereby increasing their durability,” she adds. Additionally, lots of these products contain various moisturizing agents to help reduce dryness and brittleness that often cause nails to break.
If you have persistent nail issues that nail strengtheners don’t seem to help, Dr. Rambhia suggests consulting a dermatologist to rule out any underlying health concerns.
How can I strengthen my damaged nails?
Aside from using topical nail strengtheners, there are several expert-approved ways to improve the health of weak, damaged nails.
✔️Hydrate and moisturize. “Frequent moisturizing of the nails and its surrounding skin, in conjunction with drinking enough water, can also help maintain hydration and help prevent the formation of brittle nails,” says Dr. Rambhia. So, fill up your water bottle and stock up on your go-to hand cream and cuticle oil!
✔️Keep nails short and tidy. Dr. Rambhia also suggests trimming nails regularly and keeping them on the shorter side if you notice splitting or chipping, since “longer nails are more prone to breakage.”
✔️Take a break from polish. We know you love your manicure, but giving nails a break every once in a while can benefit your overall nail health, says Dr. Farber. This is because some nail polishes and nail polish removers contain drying ingredients. “Additionally, repeated exposure to gel and acrylic manicures can compromise the integrity and strength of the nail plate, leading to increased fragility,” says Dr. Rambhia. Try taking a few days to a week off between manicures and apply only your chosen nail strengthener to your nails.
✔️Limit water exposure. “Constant exposure to water can weaken nails, making them soft and more prone to damage,” explains Dr. Rambhia. “So for those that do lots of wet work, I recommend using gloves while washing dishes or cleaning to limit water contact.”
✔️Eat a protein-rich diet. Dr. Rambhia explains that nails are made up of keratin—a type of protein. “So ensuring adequate protein intake is essential,” she says. “Lean meats, tofu, and legumes can support nail health and repair!”
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Does a nail strengthener help nails grow?
Dr. Ziechner explains that “it’s important to set realistic expectations” and remember that topical products do not directly affect the rate at which the nails grow. Rather, “by protecting the nail itself, nail strengtheners can allow the nail to grow to longer lengths than would be possible otherwise.”
“Nail strengtheners help protect the nail in several ways,” adds Dr. Farber. They seal in moisture to combat dry, brittle nails, she explains, adding that some formulas also provide protein and collagen to help support longer nails by strengthening the nails and creating optimal conditions for nail growth.
How we chose the best nail strengthener
We tested CND RESCUERXx, OPI Nail Envy, OPI Repair Mode Bond Building Nail Serum, Dr. Dana Nail Renewal System, Manucrist Active Glow Blueberry, and spoke to Joshua Zeichner, M.D., board-certified dermatologist; Pooja Rambhia, M.D., board-certified dermatologist; and Michele Farber, M.D., board-certified dermatologist for their recommendations. We also sifted through countless reviews of highly-rated products to select the best nail strengtheners available.
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Why trust us
For more than 70 years, Prevention has been a leading provider of trustworthy health information, empowering readers with practical strategies to improve their physical, mental, and emotional well-being. Our editors interview medical experts to help guide our health-focused product selections. Additionally, Prevention also examines hundreds of reviews—and often conducts personal testing done by our staff—to help you make informed decisions.
Shannen Zitz
Assistant Editor
Shannen Zitz is an Assistant Editor at Prevention, where she covers all things lifestyle, wellness, beauty, and relationships. Previously the Editorial Assistant at Prevention, she graduated from the State University of New York at Cortland with a bachelor's degree in English. If she’s not reading or writing, you can probably find her frequenting the skincare and makeup forums on Reddit or hogging the squat rack at the gym.