How to Get Healthier Nails: What Actually Works

Healthier nails come down to three things most people get wrong: protecting them from water and chemical damage, feeding them the right nutrients from the inside, and recognizing when a nail problem is actually a medical issue that no amount of care will fix on its own. The biggest misconception is that nail health is mostly about what you put on them. In reality, what you put in your body and what you stop doing to your nails matter far more than any topical product. The science behind nail care is less glamorous than the beauty industry suggests, but the evidence points to a handful of strategies that genuinely work.

Why Nails Become Brittle in the First Place

Your nails are made of tightly packed layers of a protein called keratin, and their health depends heavily on hydration balance. That sounds simple, but the problem is that nails are constantly cycling between wet and dry states throughout the day. Washing dishes, showering, cleaning, swimming: every time the nail plate absorbs water it swells, and every time it dries out it contracts. This repeated expansion and contraction weakens the bonds between keratin layers and causes peeling, splitting, and brittleness over time. Aging makes this worse because the nail plate progressively dehydrates with age, which is why older adults are more prone to fragile nails.¹

Occupational exposure amplifies the problem. Workers who wear occlusive gloves for long shifts deal with a counterintuitive issue: the trapped moisture inside the gloves over-hydrates and softens the nail plate, making nails more vulnerable to mechanical injury. In one study of clean room workers, about 39% reported nail problems, predominantly brittle nails with splitting.² So both too much and too little moisture damages nails. The goal is not to keep nails wet or keep them dry but to minimize the swings between the two states.

Biotin Supplementation

Biotin is the supplement with the most evidence behind it for nail health, though “most evidence” is relative. The research base is small, and there are no large randomized controlled trials. What does exist is encouraging. In one study of patients with brittle nails who took daily biotin, about 63% reported clinical improvement and the nail plate thickened by roughly 25%.³ Clinical trials have generally confirmed improvements in firmness, hardness, and thickness of brittle nails with oral biotin.⁴

There are a few caveats. Biotin supplementation seems to benefit people who already have brittle nails, not necessarily people whose nails are already healthy. If your nails are fine, taking biotin probably will not make them super-nails. And the improvements take time. Fingernails grow roughly 3 to 4 millimeters per month, and toenails even slower, so you would need several months of consistent supplementation before seeing a difference. Biotin is also water-soluble, meaning your body excretes what it does not use rather than storing it, which makes toxicity unlikely but also means you need to take it consistently.

One important practical warning: biotin supplements can interfere with certain lab tests, including thyroid panels and troponin (a cardiac marker). If you are taking biotin and need bloodwork, mention it to your doctor. The interference can produce false results that lead to misdiagnosis.

Beyond biotin, preventive oral supplementation with vitamins, trace minerals, and amino acids can improve nail strength.⁵ Iron deficiency is a well-known cause of spoon-shaped nails, and zinc deficiency can cause white spots and ridges. In people who already have adequate nutrition, though, mega-dosing vitamins does not seem to add benefit. The science consistently points toward correcting deficiencies rather than supplementing on top of sufficiency.

Collagen Peptides for Nail Growth

Collagen supplements have become popular for skin and joint health, and there is some evidence they help nails too. In one controlled trial, participants who took bioactive collagen peptides daily saw a 12% increase in nail growth rate and a 42% decrease in the frequency of broken nails. About 64% of participants showed a global clinical improvement in brittle nails, and the benefits persisted even four weeks after the treatment ended.⁶

The idea is that ingested collagen peptides provide amino acid building blocks, particularly proline and glycine, that the body uses in keratin production. This is a single study, so the findings deserve some caution, but the results were reasonably strong and the side-effect profile was minimal. If you are already taking collagen for other reasons, nail improvement may be an added benefit.

What Gel Polish and Acetone Do to Your Nails

Gel manicures look great and last longer than traditional polish, but the removal process is genuinely destructive. Gel polish bonds tightly to the nail plate, and getting it off typically involves prolonged soaking in acetone followed by scraping. Studies documenting the damage show measurable thinning of the nail plate after gel polish application and removal. In one case, ultrasound measurements showed the nail plate went from 0.063 cm to 0.050 cm thick after a single cycle, and confocal microscopy measurements showed an even more dramatic drop from 0.059 to 0.030 cm.⁷

Acetone strips oils from the nail plate and surrounding skin, leaving everything dry and fragile. The mechanical scraping or peeling that often follows acetone soaking removes layers of keratin along with the polish. If you do occasional gel manicures, your nails can recover in the weeks between sessions. But if you go straight from one gel set to the next without breaks, the damage compounds. Letting your nails go bare for a few weeks between gel applications gives the nail plate time to regain thickness. Using a cuticle oil after removal helps restore some of the moisture acetone strips away.

The cuticle itself deserves attention here. That thin strip of skin at the base of the nail is not a cosmetic nuisance. It acts as a seal between the nail fold and the nail plate, protecting the growth matrix underneath from bacteria and fungi. Removing or aggressively pushing back the cuticle can worsen nail fragility and invite infection.¹ Gentle pushing is fine; cutting cuticles is best avoided.

The “Toxic-Free” Nail Polish Label Problem

Walk through any beauty aisle and you will see nail polishes labeled “3-free,” “5-free,” “10-free,” even “16-free.” These numbers refer to how many supposedly toxic ingredients have been left out of the formula. The original “toxic trio” that started this trend was toluenesulfonamide-formaldehyde resin, dibutyl phthalate, and toluene, all of which had documented health concerns ranging from allergic reactions to reproductive toxicity.⁸

The problem is that these labels are largely unregulated and inconsistent. A “5-free” from one brand does not necessarily exclude the same five ingredients as a “5-free” from another. Some labels advertise being free of ingredients like gluten, soy, and fat that were never part of nail polish formulations in the first place, which amounts to marketing rather than safety improvement. When the California Environmental Protection Agency tested 23 nail polishes, seven of which were labeled “3-free,” only two actually lacked all three of the original toxic trio ingredients. Five of the “3-free” products contained high concentrations of dibutyl phthalate and toluene.⁸

Similarly, products marketed as “nontoxic” or formaldehyde-free sometimes contain formaldehyde anyway. An analysis of 29 nail products found that five contained formaldehyde, and four of those five were advertised as formaldehyde-free.⁹ Formaldehyde is used as a nail hardener in some products and is a recognized carcinogen and potent contact allergen. None of this means you need to panic about wearing nail polish, but the “free-from” numbers on the bottle are not a reliable guide to what is actually inside.

Daily Habits That Protect Nail Health

The mundane habits matter more than any single product. Here is what the evidence supports:

Wear gloves: When washing dishes, cleaning with chemical products, or doing wet work, rubber or nitrile gloves with cotton liners reduce the wet-dry cycling that causes brittleness. The cotton liner absorbs sweat so your nails do not sit in trapped moisture.
Keep nails short: Longer nails catch on things and act as levers that stress the nail bed. Shorter nails break less and collect less debris underneath.
File in one direction: Sawing a nail file back and forth frays the keratin layers at the tip. Filing in one direction produces a cleaner edge.
Moisturize nails and cuticles: Rubbing a thick moisturizer or cuticle oil into the nail plate and surrounding skin after washing your hands replaces stripped oils. Petroleum jelly works fine for this.
Trim toenails straight across: Rounding the corners encourages the nail edge to dig into the skin of the nail fold, which is the primary mechanism behind ingrown toenails.¹⁰
Do not use nails as tools: Prying, picking, or scratching with nails transmits force through the nail plate to the nail bed and matrix. Even minor repeated trauma can cause ridges, splitting, and separation from the nail bed.

None of these habits is exciting. That is sort of the point. Nail health is less about finding the right miracle product and more about not doing the things that cause cumulative damage.

When Nail Changes Signal a Medical Problem

Not every nail complaint is a cosmetic issue. Changes in nail color, shape, or texture can be indicators of underlying systemic disease.¹¹ The nail is a window into circulation, nutrition, and organ function. Because the growth rate is slow and the nail preserves a visible record of metabolic events over weeks to months, abnormalities can offer diagnostic clues that a physician would otherwise miss.

Some examples worth knowing about: spoon-shaped nails that curve upward at the edges can point to iron-deficiency anemia. Yellowed, thickened nails can indicate thyroid disease or lymphedema. Clubbing, where the fingertips enlarge and the nails curve over them, is associated with lung and heart disease. Horizontal grooves running across all nails (called Beau’s lines) suggest a systemic event that temporarily halted nail growth, such as a high fever, severe infection, or chemotherapy. Nail abnormalities can be related to local factors like edema and blood supply, but they can also reflect conditions affecting distant organ systems.¹²

The takeaway is not to diagnose yourself based on a single white spot or ridge. Vertical ridges, for instance, are almost always a normal part of aging. But if you notice a new and persistent change across multiple nails, or a dark streak under one nail that was not caused by trauma, see a dermatologist rather than reaching for a supplement.

Fungal Nail Infections

Fungal nail infections, called onychomycosis, are among the most common nail disorders. They typically cause thickening, discoloration (yellow or brown), crumbling of the nail edge, and separation of the nail from the bed. Dermatophyte fungi are the most frequent culprits, though yeasts and non-dermatophyte molds can also be involved.¹³ Toenails are affected far more often than fingernails, partly because feet spend more time in warm, damp environments inside shoes.

Accurate diagnosis requires more than just looking at the nail. Psoriasis, lichen planus, trauma, and simple aging can all mimic fungal infection.¹³ A doctor should confirm the diagnosis with a nail clipping, microscopy, or fungal culture before starting treatment, because antifungal medications are taken for months and have no reason to work if the cause is not actually a fungus.

Treatment usually involves oral antifungals taken for three to six months, depending on whether fingernails or toenails are affected. Topical antifungals exist but have low cure rates for moderate to severe infections because the medication has difficulty penetrating deep enough through the nail plate. Over-the-counter remedies like tea tree oil and vinegar soaks have limited evidence and should not be relied on for established infections.

Nail Psoriasis

Psoriasis can affect nails independently of skin, and the specific nail changes depend on which part of the nail unit is involved. When the nail matrix is affected, the result can include pitting (small depressions on the nail surface), white spots, red discoloration of the half-moon at the base, and severe nail crumbling. When the nail bed is involved, the signs shift to salmon-colored oil-drop patches, thickening under the nail, tiny splinter hemorrhages, and the nail pulling away from the bed.¹⁴

This matters for the “healthier nails” question because nail psoriasis is frequently misdiagnosed as a fungal infection, leading people to spend months on antifungal treatments that cannot help. If your nails have pitting along with thickening or if you have psoriasis patches anywhere on your skin, mention both to your doctor. Treatments for nail psoriasis are different from those for fungal infections and often involve topical steroids, vitamin D analogs, or biologic medications for more severe cases.¹⁵

Laser Therapy for Stubborn Fungal Nails

Non-thermal laser treatment has emerged as an option for toenail fungal infections that resist or are not suitable for oral antifungals. The idea is that specific wavelengths of laser light penetrate the nail plate and damage fungal cells without heating surrounding tissue enough to cause harm. An analysis of three open-label studies covering roughly 292 patients found clinical improvement in nails after laser treatment.¹⁶ A separate retrospective study found that one weekly treatment for four weeks increased the extent of clear nail in affected toenails.¹⁷

The evidence here is still early-stage. The studies are small, not randomized, and lack control groups, which means placebo effects and natural variation could account for some of the improvement. Laser treatments are also not cheap, often running several hundred dollars per session and rarely covered by insurance. For someone who cannot tolerate oral antifungals due to liver concerns or drug interactions, laser therapy is a reasonable option to discuss with a dermatologist. For everyone else, oral antifungals remain the standard of care for confirmed fungal nail disease.

Ingrown Toenails and How to Avoid Them

Ingrown toenails happen when the nail edge cuts into the surrounding skin fold, triggering pain, swelling, and sometimes infection. They are one of the most common nail complaints in primary care and podiatry, and most cases are preventable. The main culprit is how you trim. Cutting toenails too short or rounding the corners creates a sharp edge that grows into the skin as the nail advances. Tight-fitting shoes push the nail fold against the nail edge and make the problem worse.

If you catch an ingrown nail early, soaking the foot in warm water and gently lifting the nail corner with a small piece of cotton can relieve pressure. Established or recurrent cases usually need a minor procedure. The most effective approach is partial nail removal combined with phenol application to prevent regrowth of the offending nail edge. Recurrence rates with this technique have dropped to under 5% in recent reports, compared with historical recurrence rates of 13% to 50% for simpler surgical methods.¹⁰ If you get repeated ingrown nails on the same toe, the procedure is quick, done under local anesthesia, and resolves the problem permanently for most people.

1
PubMed Central. Clinical and Instrumental Objective Evidence of the Efficacy of a New Water-Based Nail-Strengthening Solution Containing Pistacia lentiscus and Hyaluronic Acid Applied for Up to 6 Months to Improve the Appearance of Weak, Brittle Nails
2
PubMed. Protection during production: Problems due to prevention? Nail and skin condition after prolonged wearing of occlusive gloves
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PubMed. Brittle nails: response to daily biotin supplementation
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PubMed. Biotin for the treatment of nail disease: what is the evidence?
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PubMed. Brittle nails
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PubMed. Oral supplementation with specific bioactive collagen peptides improves nail growth and reduces symptoms of brittle nails
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PubMed. Nail damage from gel polish manicure
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PubMed Central. Nail Polishes: A Review on Composition, Presence of Toxic Components, and Inadequate Labeling
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PubMed. Formaldehyde in “Nontoxic” Nail Polish
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BMJ. The management of ingrowing toenails
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PubMed Central. Nails in systemic disease
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PubMed. Nail disorders as clues to systemic disease
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PubMed. Onychomycosis: pathogenesis, diagnosis, and management
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PubMed Central. Nail psoriasis: clinical features, pathogenesis, differential diagnoses, and management
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PubMed. Challenge of Nail Psoriasis: An Update Review
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PubMed. Photobiomodulation with non-thermal lasers: Mechanisms of action and therapeutic uses in dermatology and aesthetic medicine
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PubMed Central. A Retrospective Study of Non-thermal Laser Therapy for the Treatment of Toenail Onychomycosis