Vertical ridges on nails are almost always a normal part of aging, not a sign of disease. About 60% of elderly adults have visible ridging and brittleness, and some degree of longitudinal ridging appears in most people by their 50s. You can minimize their appearance with consistent nail care, but completely eliminating them isn’t realistic for most people since the underlying cause is changes in how your nail matrix produces new cells over time.
Why Vertical Ridges Form
Your nails grow from a structure called the nail matrix, tucked under the skin at the base of each nail. The matrix produces layers of tightly packed cells that harden into the nail plate, which is normally about 25 layers thick with a smooth surface. As you age, the matrix becomes less efficient at producing evenly packed cells, and blood flow to the nail bed changes. The result is shallow furrows that run from the base of the nail to the tip.
The severity varies widely. Some people develop a few faint lines that are only visible in certain lighting. Others end up with deep grooves covering most of the nail surface, sometimes accompanied by splitting at the free edge. This spectrum is all part of the same process. The medical term is onychorrhexis, and it’s considered primarily cosmetic.
When Ridges Signal Something Else
Vertical ridges can occasionally point to nutritional gaps. Iron, folic acid, and protein deficiencies have all been linked to central nail ridging. If your ridges appeared suddenly or are getting worse alongside fatigue, hair thinning, or other new symptoms, a basic blood panel can rule out deficiencies.
Horizontal ridges are a different story entirely. Called Beau’s lines, these run side to side across the nail and tend to be deeper than vertical ridges. They’re associated with more serious disruptions like severe infections, uncontrolled diabetes, or high fevers. If you’re seeing horizontal dents rather than vertical lines, that warrants medical attention.
There’s also a more severe form of nail roughness called trachyonychia, where nails become brittle, thin, and covered in excessive ridging. In the more pronounced version, nails lose their shine completely and may split easily. In the milder version, nails keep their luster but develop fine ridging with small geometric pits. Normal age-related ridging is milder and typically doesn’t involve the entire nail surface. Trachyonychia can be linked to skin conditions like lichen planus or alopecia areata, and it sometimes appears in children.
Biotin Supplementation
Biotin is the most studied supplement for nail quality. A Swiss clinical trial found that daily biotin supplementation produced a 25% increase in nail plate thickness in people with brittle nails. The typical dose used in research is 2.5 mg per day, and you’ll need patience: nails grow roughly 3 to 4 millimeters per month, so it takes at least 6 months to see the full effect as the entire nail replaces itself.
Biotin won’t erase ridges caused by aging, but thicker, stronger nails tend to look smoother and resist the splitting that makes ridges more noticeable. It’s water-soluble, so excess is excreted in urine, but one important caveat: biotin can interfere with certain lab tests, including thyroid panels and troponin (used to diagnose heart attacks). If you’re getting blood work done, let your provider know you’re taking it.
Moisturizing and Topical Care
Dry, dehydrated nails make ridges look more pronounced. Keeping the nail plate and surrounding cuticles moisturized is one of the simplest ways to reduce their visibility. Look for thick creams or nail oils rather than thin lotions, and apply them after washing your hands or showering when the nail is slightly damp.
Urea-based creams are particularly effective for nail care. At concentrations of 40% to 50%, urea softens the nail plate and enhances its permeability, which is why dermatologists recommend it for various nail disorders. For everyday ridge management, a lower concentration (10% to 20%) applied to the nails and cuticles can help keep the surface smoother and reduce brittleness without over-softening the nail. These creams are available over the counter in most pharmacies.
Buffing: Effective but Easy to Overdo
A fine-grit nail buffer can physically smooth out shallow ridges, and the results are immediate. The catch is that you’re literally removing layers of nail plate to create that smooth surface. Since the average nail is only about 0.5 to 1 mm thick, aggressive or frequent buffing thins the nail to the point where it becomes weak, flexible, and prone to breakage.
Limit buffing to once a month at most. Use the finest grit side of a multi-sided buffer and apply light, even pressure in one direction rather than sawing back and forth. If your nails feel tender or look translucent after buffing, you’ve gone too far. Let them grow out completely before buffing again.
Protecting Nails From Further Damage
Chemical exposure accelerates the breakdown of the nail plate and worsens existing ridges. A few practical habits make a noticeable difference over time:
- Wear gloves for wet work. Dish soap, cleaning products, and even prolonged water exposure strip oils from the nail plate. Cotton-lined rubber gloves are the single most protective thing you can do if you wash dishes by hand or clean frequently.
- Avoid acetone-based nail polish remover. Acetone is extremely drying to the nail plate. Non-acetone removers take a bit longer but cause far less dehydration.
- Skip harsh manicure habits. Pushing cuticles back too aggressively or using metal tools to scrape the nail surface can damage the matrix and worsen ridging over time.
- Use a ridge-filling base coat. If you wear polish, ridge-filling formulas contain fine particles that settle into grooves and create a smoother surface. This is purely cosmetic, but it’s the fastest way to make ridges invisible.
What Results to Realistically Expect
If your ridges are mild to moderate and mainly age-related, a combination of biotin, consistent moisturizing, and gentle buffing can make them significantly less visible. You won’t return to the perfectly smooth nails of your 20s, but most people notice real improvement within 3 to 6 months of consistent care. The key word is consistent: nails grow slowly, and any intervention needs time to show up in the new growth.
If your ridges are deep, cover more than half the nail surface, or are accompanied by splitting, thinning, or color changes, a dermatologist can evaluate whether an underlying condition is involved. Inflammatory skin diseases, thyroid disorders, and nutritional deficiencies all produce nail changes that look similar to age-related ridging but respond to targeted treatment rather than cosmetic care alone.