💚 TL;DR
- Vertical ridges on nails — lines running from the base of the nail to the tip — are most commonly caused by normal ageing and are usually harmless.
- When a vitamin deficiency is responsible, the most likely culprits are iron, vitamin D, magnesium, B vitamins (especially B12 and B7/biotin), and vitamin C.
- Vertical ridges are distinct from horizontal ridges (Beau’s lines) — horizontal ridges are more clinically significant and can signal systemic illness, severe malnutrition, or chemotherapy effects.
- Most nutritional causes of vertical ridges on nails resolve within 3–6 months of correcting the underlying deficiency — nails grow slowly, so patience is required.
Vertical ridges on nails — also called longitudinal ridges or onychorrhexis — are raised, parallel lines that run from the base of the nail to the tip. They are extremely common and, in most cases, a completely normal part of ageing. But when they appear in younger people, or worsen noticeably, a vitamin deficiency may be playing a role.
Your nails are a surprisingly reliable window into your nutritional status. Because nails are made of keratin protein and grow continuously from the nail matrix, any disruption to nutrition, circulation, or cell division shows up as visible changes in their texture, colour, and structure weeks to months later.
This guide covers the main causes of vertical ridges on nails, which specific vitamin deficiencies are most commonly responsible, how to distinguish harmless ridges from clinically significant nail changes, and what to do about them.
⚕️ Medical Disclaimer: This article is for informational purposes only. Nail changes can occasionally indicate underlying medical conditions. If your nail changes are sudden, severe, or accompanied by other symptoms, please see your GP for assessment before self-treating.
Last updated: May 2026
What Are Vertical Ridges on Nails?
Vertical ridges on nails — known medically as longitudinal striations or onychorrhexis — are raised lines that run parallel to each other in a direction from the base (cuticle end) to the tip of the nail. They are extremely common and become more pronounced with age.
Nails are composed of keratin — the same protein that makes up hair and skin. They grow from the nail matrix (the tissue underneath the base of the nail) and can take 3–6 months to fully grow out. Any disruption to the nail matrix — from nutritional deficiency, illness, trauma, or simply the natural effects of ageing — shows up as visible changes in the nail surface.
According to 2022 research cited by Healthline, vertical ridges on nails are most commonly due to ageing — a natural slowing of cell turnover within the nail matrix. But they can also be accelerated or worsened by nutritional deficiencies, dry skin, dehydration, and certain health conditions. Understanding which cause applies to you is the key to addressing them effectively.
💡 Did You Know? Vertical ridges on nails are clinically called onychorrhexis, from the Greek for “nail” and “breaking.” As the body ages, the nail matrix produces keratin less uniformly — causing the striated, ridged texture that becomes increasingly pronounced after age 50. According to Cleveland Clinic’s nail health guidance, vertical ridges are usually harmless — but they can become a diagnostic clue when accompanied by brittleness, colour changes, or other nail abnormalities, particularly in younger adults where ageing is less likely to be the primary cause.
Vertical vs Horizontal Ridges: An Important Distinction
Before exploring vertical ridges on nails vitamin deficiency connections, it is crucial to distinguish between the two main types of nail ridges — because they have very different clinical significance.
Vertical ridges (longitudinal, running from cuticle to tip) are nearly always benign. In most cases they represent normal ageing, dry skin, mild nutritional imbalances, or minor trauma to the nail. They rarely indicate serious illness.
Horizontal ridges — known as Beau’s lines — run across the nail from side to side. These are more clinically significant. Beau’s lines indicate something that interrupted nail growth at a specific point in time. Causes include: severe illness or fever, major surgery, chemotherapy, uncontrolled diabetes, severe nutritional deficiency (particularly zinc or protein), and serious systemic stress. Multiple Beau’s lines across all fingernails simultaneously suggests a body-wide event — and warrants medical investigation.
If you have deep horizontal ridges across multiple nails, please see your GP. This guide focuses specifically on vertical ridges on nails and their vitamin deficiency connections.
Vitamin Deficiency and Vertical Ridges on Nails
While ageing is the most common cause, a vitamin deficiency is a frequently overlooked contributor to vertical ridges on nails — particularly when ridges appear in younger adults or worsen noticeably over a short period.
1. Iron Deficiency and Vertical Ridges on Nails
Iron deficiency is the most common nutritional cause of vertical ridges on nails. Iron is essential for oxygen transport via haemoglobin — and the nail matrix, like all rapidly dividing tissue, requires good oxygenation to produce smooth, healthy keratin.
When iron is deficient, nail growth is disrupted, producing longitudinal ridging. In more severe iron deficiency, this progresses to koilonychia — spoon-shaped nails where the centre of the nail develops a depression rather than the normal convex shape. Koilonychia is considered a late sign of significant iron deficiency anaemia.
Iron deficiency is particularly common in pre-menopausal women, vegetarians and vegans, athletes (especially runners, due to haemolysis), and people with heavy periods or digestive conditions affecting iron absorption. A ferritin blood test is the most sensitive measure of iron stores — serum iron alone is insufficient.
2. Vitamin D Deficiency and Vertical Ridges on Nails
Vitamin D receptors are present in nail matrix cells, and vitamin D plays a direct role in regulating nail growth and health. A vitamin D deficiency contribution to vertical ridges on nails is increasingly recognised — particularly brittle nails with vertical ridges that peel easily.
The Cleveland Clinic notes that thyroid disease produces thick, brittle nails with vertical ridges — and vitamin D deficiency is closely associated with thyroid dysfunction, making the relationship between vitamin D status and nail changes complex and multi-directional.
Vitamin D deficiency is extremely prevalent — estimated to affect approximately 1 billion people worldwide. Other vitamin D deficiency signs to look for alongside nail changes include bone pain, muscle weakness, fatigue, low mood, and frequent infections.
3. Biotin (Vitamin B7) Deficiency and Vertical Ridges on Nails
Biotin is the vitamin most commonly marketed for nail health — and with some justification. Biotin (vitamin B7) is essential for keratin production, and biotin deficiency produces brittle nails that fracture easily, often with longitudinal ridging and splitting at the tips.
The clinical evidence for biotin supplementation improving nail health is modest but real — a small number of studies show that 2.5mg biotin daily reduces nail brittleness and fracturing. However, outright biotin deficiency is rare in people eating a balanced diet. Biotin is found in eggs, nuts, seeds, salmon, and sweet potato — severe deficiency typically only occurs in people with specific genetic disorders or who consume large amounts of raw egg white (which contains avidin, a protein that blocks biotin absorption).
4. Magnesium Deficiency and Vertical Ridges on Nails
Magnesium plays a role in protein synthesis including keratin production, making magnesium deficiency a potential contributor to vertical ridges on nails. Research from clinical nail health literature identifies magnesium deficiency as associated with vertical ridging, particularly when accompanied by nail brittleness and fragility.
Magnesium deficiency is more common than many people realise — estimates suggest up to 45% of Western adults consume below the recommended daily intake. Low magnesium is associated with muscle cramps, poor sleep, fatigue, and anxiety alongside its effects on nail health. It is worth addressing comprehensively rather than treating the nail changes in isolation.
5. Vitamin B12 and Folate Deficiency
Both B12 and folate (vitamin B9) are essential for DNA synthesis and cell division — processes central to nail matrix cell production. Deficiency of either can produce nail changes including ridging, brittleness, and nail hyperpigmentation (particularly in B12 deficiency).
B12 deficiency is particularly prevalent in people over 50 (due to reduced intrinsic factor production), vegans and vegetarians (B12 is found almost exclusively in animal products), and those taking metformin (which reduces B12 absorption). Folate deficiency is common in pregnancy, in people with poor dietary variety, and in heavy alcohol drinkers. WebMD’s nail health guidance notes that ridges may appear “if you have an eating disorder or if you’re low in nutrients such as iron, folic acid (vitamin B9) or protein.”
Other Causes of Vertical Ridges on Nails
Beyond vitamin deficiency, vertical ridges on nails have several other common causes worth understanding.
Ageing: The most common cause overall. As we age, oil and moisture production in the nail plate decreases, cell turnover slows, and the nail matrix produces less uniform keratin. Vertical ridges become increasingly common from the mid-30s onwards and are considered a normal ageing finding by dermatologists.
Dry skin and dehydration: Nails are an extension of skin. Chronic dehydration and dry skin significantly affect nail quality, contributing to ridging and brittleness. Moisturising the hands and nails regularly — particularly at the cuticle where the nail matrix is accessible — can meaningfully reduce ridges caused by dryness.
Thyroid disease: Both hypothyroidism and hyperthyroidism can cause nail changes. Hypothyroidism specifically produces thick, brittle nails with pronounced vertical ridges and occasionally changes to nail shape. This is worth investigating if vertical ridges on nails are accompanied by fatigue, cold sensitivity, weight changes, or hair thinning.
Psoriasis and eczema: Both conditions affect the skin around and beneath the nail, causing a range of nail changes including ridging, pitting, and discolouration. Nail psoriasis is present in approximately 50% of people with skin psoriasis and 80% of those with psoriatic arthritis.
Physical trauma: Repeated minor trauma to the nail — from nail biting, aggressive manicures, pressing hard on keyboards, or even habitual rubbing of the nail surface — can cause or worsen vertical ridges on nails over time.
What Different Nail Changes Mean
Different types of nail change suggest different nutrient deficiencies or health issues. This reference helps decode what you are seeing alongside your vertical ridges on nails.
Vertical ridges + brittle, splitting nails: Most likely iron deficiency, biotin deficiency, or thyroid dysfunction. Consider ferritin and thyroid function tests.
Vertical ridges + peeling nails: Often associated with vitamin D deficiency or chronic dehydration. Check vitamin D status, especially in winter months or if you avoid sun exposure.
Vertical ridges + spoon-shaped nails (koilonychia): Classic sign of significant iron deficiency anaemia. Requires blood testing and iron supplementation under medical supervision.
White spots on nails: Often attributed to zinc deficiency, though minor trauma is also a common cause. Note: white spots are not typically vertical ridges — they are a separate nail finding. Our detailed article on zinc deficiency symptoms covers all the nail changes associated with zinc deficiency specifically.
Horizontal ridges (Beau’s lines): See a GP. These indicate a systemic event that interrupted nail growth and require investigation.
Nail discolouration (yellow, brown, or hyperpigmented): Associated with B12 deficiency, fungal infection, or psoriasis. Needs investigation if persistent.
How to Treat Vertical Ridges on Nails
The appropriate treatment for vertical ridges on nails depends entirely on the underlying cause. There is no single universal remedy.
If ageing is the cause: Moisturise hands and nails daily — use a rich hand cream focusing on the cuticle area. This improves the nail plate’s moisture content and visibly softens ridges over time. Nail oils containing jojoba, vitamin E, or sweet almond oil work well. Accept that some degree of ridging is normal and does not require medical intervention.
If vitamin deficiency is suspected: Get blood tests before supplementing. The most useful panel for nail health concerns is: full blood count (for anaemia), serum ferritin (iron stores), vitamin D (25-OH), vitamin B12, folate, and thyroid function. This comprehensive panel provides the information needed to target supplementation appropriately rather than taking multiple supplements speculatively. According to NHS guidance on B12 and folate deficiency, targeted treatment of confirmed deficiencies produces better outcomes than general supplementation.
If iron deficiency is confirmed: Iron supplementation under medical supervision. Ferrous fumarate and ferrous sulfate are effective; take with vitamin C to improve absorption and away from tea, coffee, and calcium-rich foods which inhibit it. Expect nail improvement over 3–6 months as new nail grows in.
General nail care: Regardless of cause, keep nails trimmed short, avoid harsh nail products (acetone-based removers dry the nail plate), wear gloves for cleaning and washing up, and moisturise the entire hand and nail after every handwash.
Frequently Asked Questions
What vitamin deficiency causes vertical ridges on nails?
The most common vitamin deficiency causes of vertical ridges on nails are iron deficiency (most common), vitamin D deficiency (brittle ridged nails, often with peeling), biotin (B7) deficiency (brittle splitting nails), magnesium deficiency (ridging with brittleness), and B12 or folate deficiency (ridging sometimes with nail discolouration). It is worth noting that ageing is the most common overall cause — vitamin deficiency is more likely when ridges appear prematurely, worsen rapidly, or are accompanied by other nutritional deficiency signs such as fatigue, hair thinning, or skin changes.
Are vertical ridges on nails normal?
Yes — vertical ridges on nails are extremely common and are considered a normal finding, particularly with ageing. Research published in 2022 identified ageing as the most frequent cause of longitudinal nail ridging. They are not dangerous in isolation and do not typically require medical treatment. However, if they are accompanied by changes in nail colour, significant brittleness, nail thickening, spoon-shaped nails, or you are under 30 and developing pronounced ridges, it is worth investigating potential vitamin or mineral deficiencies or underlying health conditions.
Can vertical ridges on nails go away?
Yes — when vertical ridges on nails are caused by a vitamin deficiency, addressing the deficiency typically results in gradual improvement as new, healthier nail grows in. Because fingernails take 3–6 months to fully grow out, improvement is slow but visible. Age-related ridges do not fully resolve (they are a permanent feature of older nail tissue) but can be significantly improved with nail moisture care. Treating the underlying cause — whether deficiency, thyroid issue, or skin condition — is always more effective than cosmetic solutions like nail buffing, which temporarily smooths the surface but can thin and weaken the nail plate.
When should I see a doctor about vertical ridges on nails?
See your GP if: the ridges appear suddenly or worsen rapidly; the ridges are accompanied by significant colour changes (yellowing, browning, or dark streaks); horizontal ridges appear across multiple nails; your nails develop a spoon shape (koilonychia); the ridges are accompanied by other symptoms such as fatigue, hair loss, or unexplained weight change; or you are under 30 and developing pronounced vertical ridges on nails without obvious cause. These scenarios suggest a systemic cause that warrants a blood test rather than a nutritional supplement.
🌿 Your Nails Are Talking — Are You Listening?
Vertical ridges on nails are often just the body ageing gracefully — and that is fine. But when they appear early, worsen quickly, or come with other signs of nutritional gaps, they are worth paying attention to. A simple blood panel, good hydration, targeted nutrition, and daily hand care are usually all it takes to see meaningful improvement over the following months. 💚
✍️ About the Author
This article was written by the editorial team at Blooming Vitality, a health and wellness platform dedicated to evidence-based nutrition guidance. Our content is reviewed against current peer-reviewed research, Cleveland Clinic guidelines, and NHS clinical resources.
