What Causes Vertical Ridges on Fingernails as You Age?

Written by the Nuvirox Research Team

Short answer: age-related vertical nail ridges are a cosmetic, largely harmless change in how the nail matrix produces keratin over time — not, in most people, a sign of a nutrient deficiency or disease. If you're noticing more of those fine lines running the length of your nails as you've gotten older, that lines up with what dermatology sources describe as one of the most common nail surface changes in adults, becoming more numerous and pronounced with each passing decade. The key distinction to know is between these vertical ridges and horizontal ones, since they mean very different things.

What's actually happening in the nail when ridges form?

The nail matrix — the engine room under your cuticle — starts producing keratin less uniformly. Your nail plate is manufactured continuously by the nail matrix, a specialized tissue that, in youth, produces a flat, even sheet of keratin. With age, according to dermatology sources, the matrix's cell turnover slows and becomes less uniform: some vertical bands of the nail plate end up slightly thicker than the bands right next to them. That microscopic unevenness in thickness is what you feel and see as a ridge running the length of the nail.¹ Mayo Clinic describes this plainly: vertical nail ridges commonly become more numerous or prominent with age because of changes in cell turnover within the nail.²

Is this the same as "brittle nails"?

Related, but not identical. Onychorrhexis — the clinical term for these vertical ridges — is described as one of the main presentations of nail brittleness, a category that also includes onychoschizia (horizontal splitting of the nail plate).¹ Nail brittleness overall is reported to affect roughly 2 in 10 people, more often women, and can include splitting, softening, and flaking in addition to ridging. So ridging can occur as part of a broader brittle-nail pattern, or it can show up largely on its own as a purely cosmetic surface change with otherwise normal, non-brittle nails.

Why do dermatology sources connect this to circulation and genetics too?

Because the nail matrix's blood supply and your inherited nail plate thickness both influence how visible ridging becomes. Decreased peripheral circulation to the extremities — itself an age-related change — is cited as compromising nail health and contributing to ridge formation, on top of the matrix cell-turnover changes.³ Genetics plays a role too: some people are simply predisposed to thinner nail plates, the same way some people are predisposed to thinner skin or finer hair, which makes any given amount of matrix unevenness more visible as a ridge.

What's the difference between vertical ridges and horizontal ridges?

Timing and cause are completely different, and this distinction matters clinically. Vertical ridges run from the cuticle to the nail tip and reflect the ongoing, gradual pattern of matrix aging described above. Horizontal ridges — called Beau's lines — run across the nail and form when something temporarily disrupts nail growth altogether: a fever, an illness, chemotherapy, a significant nutrient deficiency, or physical trauma to the nail matrix.⁴ Because horizontal ridges mark a discrete interruption in growth, they eventually grow out as the nail lengthens, and their appearance is a reasonable prompt to mention to a doctor if you can't identify an obvious recent cause. Vertical, age-related ridging doesn't behave this way — it doesn't "grow out" because it isn't tied to one event.

What won't fix age-related ridging

Buffing can smooth the surface cosmetically, but overdoing it — more than about once a month — can thin and weaken the nail plate further. There's no oral supplement, including collagen, with human trial evidence specifically showing reversal of age-related vertical ridging; most of what's marketed toward "smoother nails" targets nail growth rate and overall brittleness broadly rather than ridge formation specifically, and claims should be read with that gap in mind. See a doctor if ridges appear on just one nail out of nowhere (possible localized trauma or, rarely, a matrix growth), if they're horizontal rather than vertical, or if they're accompanied by color changes, pitting, or nail separation.

What the sources actually say

Prevalence and mechanism: Clinical and dermatology sources describe vertical ridging as showing up in a large majority of older adults, driven by nail matrix cells that grow larger and less uniform over time, alongside thickening of the blood vessels and connective tissue beneath the nail bed that alters how smoothly the plate grows out.³ Mayo Clinic frames the same pattern more conservatively, attributing increased ridge prominence with age specifically to "changes in cell turnover within the nail," without asserting a single definitive mechanism.²

Honest counterweight: Much of the specific mechanistic detail on nail matrix aging comes from dermatology review and patient-education sources rather than large-scale, peer-reviewed cohort studies tracking nail matrix histology across age groups — the underlying biology is plausible and consistent with what's known about skin and connective tissue aging generally, but it hasn't been quantified with the same rigor as, say, skin collagen decline.

FAQ

Should I worry if only some of my nails have ridges and others don't? Not usually — matrix aging doesn't have to affect every nail identically, and hands used more for gripping or manual tasks can show more pronounced ridging on certain fingers.

Do vertical ridges mean I'm deficient in something? Not typically for age-related ridging specifically, though horizontal ridges, pitting, or spoon-shaped nails can sometimes reflect zinc or iron status and are worth mentioning to a doctor if they appear alongside other symptoms.

Can moisturizing actually help? Keeping the nail and cuticle hydrated with a heavy cream can make existing ridges less visually pronounced and reduce splitting along them, even though it doesn't change the underlying matrix production pattern.

Is buffing safe to smooth them out? Occasionally, yes, but dermatology sources caution against buffing more than about once a month, since it thins the nail plate and can worsen brittleness over time.

From Nuvirox

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The bottom line

Vertical nail ridges are one of the most common, mostly cosmetic signs of nail aging, driven by a nail matrix that produces keratin less evenly as cell turnover slows — not, in the typical case, a marker of illness. Horizontal ridges are the pattern that's actually worth flagging to a doctor.

References

1. Onychorrhexis Explained: Causes and Treatment. Healthgrades/PubMed Central summary.
2. Nail ridges: Cause for concern? Mayo Clinic.
3. What Makes Ridges in Fingernails: Causes and Treatments. ScienceInsights, 2026.
4. Ridges in Nails: Horizontal, Vertical, Causes & Treatment. Cleveland Clinic.

For the broader question of what taking collagen does and doesn't change about nails, see how long collagen takes to show results. For a related connective-tissue aging topic, see why nails become weak and brittle with age.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.