
Nail hardeners are designed to help people who struggle with weak, brittle, or soft nails. They create a protective barrier on the nail, reinforcing and thickening them to make them less prone to breaking. This protective barrier helps nails grow longer and stronger. While nail hardeners are a great temporary solution, they are not a long-term fix due to their harsh chemical makeup. Once nails are no longer peeling, transitioning to a nail strengthener is recommended.
| Characteristics | Values |
|---|---|
| Purpose | Strengthen and fortify weak, brittle nails |
| Function | Hardeners create a protective barrier on the nail, while treatments nourish the nail from the inside out |
| Effectiveness | Hardeners are more effective in the short term, while treatments are better for long-term nail health |
| Ingredients | Wheat protein, keratin, biotin, calcium, nylon, sulfhydryl protein, rapeseed oil, vitamin A, vitamin E |
| Application | Applied like nail polish, once a week to encourage healthy nail growth |
| Results | Nails become stronger, healthier, and less prone to breaking |
| Considerations | May contain harsh chemicals like formaldehyde or toluene that can damage nails with consistent or excessive use |
| Recommendations | ONYX Professional's Hard As Hoof Nail Strengthening Cream, Londontown's Nail Hardener and Base Coat, Sally Hansen Treatment Hard as Nails Serum, OPI Repair Mode Bond Building Nail Serum |
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What You'll Learn

Nail hardeners can help those with thin nails
Nail hardeners are an effective solution for people with thin nails who want to strengthen them and promote growth. They work by forming a protective barrier or shell over the nails, reinforcing and thickening them, and thereby reducing their proneness to breakage.
Hardeners are particularly useful for those who are having extreme difficulty growing their nails due to consistent breakages. They can help salvage length while your nails grow strong and healthy. They are also suitable for people who paint their nails frequently and want a strengthening base coat.
To use a nail hardener, start by removing any existing nail polish or residue using a gentle nail polish remover. Then, apply the hardener as a base coat underneath your nail polish, or it can be used alone. It is typically applied once a week to encourage healthy nail growth.
It is important to note that nail hardeners are not a long-term solution due to their harsh chemical makeup, and they should be used in moderation. Once your nails are stronger, you can transition to a nail strengthener, which contains conditioning ingredients like oils and keratin to promote the growth of long, healthy nails.
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They create a protective barrier to prevent damage
Nail hardeners are a great option for those who want to grow their nails but are facing difficulties due to weak, brittle, or soft nails. They are designed to create a protective barrier on the nails, providing an extra layer of defence against external factors that can cause damage. By improving the overall health and appearance of nails, regular use of nail hardeners can lead to stronger and more appealing results.
Nail hardeners form a hard, protective shell over the nails, reinforcing and thickening them, and making them more resistant to breaking. This protective barrier helps to salvage length while your nails grow out, allowing you to achieve your desired nail goals. The hardener works by interacting directly with the natural nail surface, strengthening and shielding it from potential harm.
It is important to note that nail hardeners are typically more effective in the short term, such as when a nail splits down the middle. They can be applied at any time, depending on your preference and nail care routine. However, it is generally recommended to apply them after removing nail polish or other nail products to ensure direct contact with the natural nail. This maximises the strengthening and protective effects of the hardener.
Some nail hardeners contain ingredients that promote nail growth, accelerating the replacement of weak, damaged nails with stronger, healthier ones. These growth-enhancing components can include wheat protein, keratin, and biotin, which work to fortify and nourish the nails. However, it is crucial to follow the application guidelines provided by the product manufacturer to ensure optimal results and prevent any adverse reactions.
While nail hardeners can be a great temporary solution, they may not provide a long-term answer to stronger nails due to their harsh chemical composition. Consistent or excessive use of certain nail hardeners can lead to dryness and increased brittleness over time. Therefore, it is recommended to use these products as a preventive measure and transition to nail strengtheners once your nails are healthier.
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Nail strengtheners penetrate the nail bed to hydrate and nourish
Nail strengtheners are a great way to improve the health and appearance of your nails. They can help with weak nails caused by physical damage, often from artificial nail treatments, or due to changes in the body, like hormonal fluctuations or nutrition deficiencies. By nourishing and strengthening the nail bed, these treatments promote nail growth and improve texture.
Nail strengtheners penetrate the nail bed with hydrating ingredients, adding shine and moisture to your nails. Hydration is key to maintaining nail health, and certain strengtheners can fill in damage from gels and acrylics while nourishing the cuticles. For instance, Chanel's Protective and Smoothing Nail Treatment can be used as a strengthener and a base coat, nourishing the nail and alleviating dryness with camellia oil. It also contains cellulose to repair the nail's surface, leaving the nail feeling and looking less brittle.
ONYX Professional's Hard As Hoof Nail Strengthening Cream is another product with a creamy texture that absorbs into the nails with minimal effort. Formulated with moisturizing ingredients like coconut oil, shea butter, and jojoba seed oil, it leaves nails looking more hydrated and healthier.
Some nail strengtheners also act as a protective barrier on the nail, giving them an extra layer of protection from potentially damaging external elements. Londontown's Nail Hardener and Base Coat, for instance, is made with rapeseed oil, vitamin A, vitamin E, and biotin, which leaves nails hydrated and nourished. It also serves as a protective barrier between the nail and typical nail polish.
Nail strengtheners can be applied at any time, but it is recommended to apply them after removing nail polish or any other nail products. This maximizes the product's ability to strengthen and shield the nails by enabling direct interaction with the natural nail surface.
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$15.73 $17.98

Ingredients like keratin and biotin can help promote growth
Nail hardeners are used to strengthen and fortify weak, brittle nails. They typically create a protective barrier on the nails, giving them an extra layer of protection from potentially damaging external elements. While nail hardeners improve the general health and appearance of nails, they are more effective in the short term.
For long-term nail health, treatments are a better option. These nourish the nail from the inside out and can be used as often as you like. Ingredients like wheat protein and keratin are two common and effective options to look for in treatments.
Keratin is a protein that functions as the primary component of finger- and toenails. The body needs specific amino acids to manufacture keratin. There is some evidence to suggest that increasing the body's supply of these nutrients by taking a keratin supplement could promote stronger nails and support growth. Cynatine HNS is a form of keratin used in some vitamins to strengthen nails. The keratin is solubilized to increase bioavailability.
Biotin is another ingredient proven to help promote healthy nail growth. It is a water-soluble vitamin that serves as an essential cofactor for carboxylase enzymes in multiple metabolic pathways. Biotin is also known as vitamin B7 or vitamin H. It is a required cofactor for carboxylase enzymes that become activated once they are joined together by holocarboxylase synthase. These enzyme complexes play an important role in multiple metabolic processes, including gluconeogenesis, fatty acid synthesis, and amino acid catabolism.
Biotin's function in protein synthesis and, more specifically, in keratin production, explains its contribution to healthy nail and hair growth. While biotin has gained commercial popularity for its claimed benefits on healthy hair and nail growth, there is limited research to support its utility in healthy individuals. However, in all reported cases of biotin use for hair and nail changes, patients with underlying pathologies for poor hair or nail growth showed evidence of clinical improvement after receiving biotin.
In addition to keratin and biotin, other ingredients that promote nail health include elastin, copper, zinc, niacin, vitamin B6, and pantothenic acid.
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Consistent or excessive use of nail hardeners can have adverse effects
Formaldehyde, an ingredient in some nail hardeners, can have detrimental effects on nail health over time. Initially, it may make nails appear very strong, but prolonged use may weaken the nails, making them brittle and more prone to breakage or peeling. Additionally, formaldehyde can cause skin irritation and allergic reactions. Primary irritants from formaldehyde are more common than allergic reactions, and they include inflammatory and non-inflammatory onycholysis, paronychia, chromonychia, nail plate shedding, and pterygium inversum unguis.
Toluene, another chemical found in nail hardeners, has been associated with adverse reactions. While its use is being phased out, it is still present in some products. Toluene can cause onycholysis, a condition where the nail separates from the nail bed, mimicking onychomycosis, a fungal nail infection.
Artificial nails, which are applied in salons or at home, may also contain harmful chemicals. Traces of reactive monomers, such as methacrylate, can result in adverse reactions, including redness, swelling, and pain in the nail bed for those sensitive or allergic to these substances.
It is worth noting that some nail hardeners are formulated without harmful ingredients. Vegan, gluten-free, and cruelty-free options are available, ensuring a safe and ethical approach to achieving strong and beautiful nails. However, it is always recommended to consult a dermatologist or nail care specialist for individualized guidance regarding your unique nail health.
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Frequently asked questions
Yes, nail hardeners can help nails grow by creating a protective barrier over nails, reinforcing and thickening them, and making them less prone to breaking.
Nail hardeners are usually transparent or translucent and are applied like nail polish. It is recommended to use a nail hardener after removing any nail polish or residue and to use it as a base coat underneath your nail polish or alone.
Nail hardeners are designed for those who need a quick fix to strengthen soft, bendy, or brittle nails. They can help salvage length while your nails grow strong and healthy.
While nail hardeners can be a great temporary solution, they are not a long-term fix for stronger nails due to their harsh chemical makeup. Consistent or excessive use can have the opposite effect and make nails more prone to breakage.
Yes, nail strengtheners are a good alternative for someone who already has nails that are in good shape and wants to prevent brittle or unhealthy nails. Nail strengtheners contain ingredients like keratin, which penetrates between the nail layers to help strengthen the nail plate over time.











































