Vertical ridges on the nails are common, especially as we get older. In many cases, they’re harmless and simply part of the natural aging process. However, when ridges become more noticeable, brittle, or are accompanied by other changes in nail texture or color, they can sometimes reflect nutritional imbalances. The good news? What you eat plays a major role in nail strength and appearance.

Here’s what to include in your diet if you want smoother, stronger nails.

1. Protein: The Foundation of Strong Nails

Nails are made primarily of keratin, a type of protein. If your diet lacks adequate protein, nails can become weak, thin, and more prone to ridging or splitting.

Add high-quality protein sources such as:

• Eggs
• Lean poultry
• Fish
• Greek yogurt
• Beans and lentils
• Tofu

Aim to include a source of protein at every meal. This helps support continuous keratin production and overall nail resilience.

2. Biotin (Vitamin B7): The Nail-Strengthening Nutrient

Biotin is one of the most well-known nutrients for nail health. Studies suggest that biotin supplementation may improve brittle nails, but many people can get enough from food alone.

Good dietary sources of biotin include:

• Eggs (fully cooked)
• Almonds and walnuts
• Sweet potatoes
• Spinach
• Salmon

Biotin supports keratin structure, helping nails grow thicker and less prone to ridging caused by fragility.

3. Iron: Preventing Weak or Grooved Nails

Iron deficiency can lead to thin nails and, in more severe cases, spoon-shaped nails (koilonychia). While vertical ridges alone don’t automatically mean iron deficiency, persistent weakness or fatigue alongside nail changes may be worth discussing with a healthcare provider.

Iron-rich foods include:

• Lean red meat
• Chicken thighs
• Lentils
• Chickpeas
• Pumpkin seeds
• Dark leafy greens
• Pair plant-based iron sources with vitamin C–rich foods like citrus fruits or bell peppers to improve absorption.

4. Zinc: Supporting Growth and Repair

Zinc plays an essential role in cell growth and repair. A deficiency may contribute to nail abnormalities, including ridges or white spots.

Include foods such as:

• Oysters
• Beef
• Cashews
• Sunflower seeds
• Whole grains

Because the body does not store zinc efficiently, consistent intake is important.

5. Omega-3 Fatty Acids: Improving Moisture and Flexibility

Dry, brittle nails can make ridges more noticeable. Omega-3 fatty acids help support nail bed hydration and reduce inflammation.

Add these sources:

• Fatty fish (salmon, sardines, mackerel)
• Chia seeds
• Flaxseeds
• Walnuts

Healthy fats also improve circulation, delivering nutrients more effectively to the nail matrix.

6. Stay Hydrated

Dehydration can worsen nail dryness and exaggerate ridges. Drink enough water daily and include hydrating foods like cucumbers, oranges, and watermelon. Proper hydration supports overall skin and nail elasticity.

When to See a Doctor

While diet can improve nail health over time, sudden changes—such as deep horizontal ridges (Beau’s lines), dark streaks, or painful nail changes—should be evaluated by a healthcare professional. These may reflect underlying medical conditions rather than simple nutrient gaps.

The Bottom Line

Smooth, healthy nails start from within. Prioritize protein, biotin, iron, zinc, omega-3s, and proper hydration. Most importantly, be patient—nails grow slowly, and visible improvements can take several months.

With consistent nutrition and overall healthy habits, your nails can become stronger, smoother, and more resilient naturally.