The primary component of nails is keratin, a tough structural protein also found in hair and the outer layer of skin.
Keratin gives nails their strength and durability.
Water
Healthy nails naturally contain water.
Too little moisture can contribute to brittleness, while repeated cycles of soaking and drying may weaken the nail plate over time.
Natural Lipids
Small amounts of natural oils help maintain flexibility.
These lipids reduce cracking and make nails less likely to split.
Minerals
Minerals such as iron, zinc, and magnesium contribute to many of the body’s normal biological processes involved in nail growth and maintenance.
Six Important Nutrients for Healthy Nails
1. Protein
Since nails are primarily composed of keratin, consuming adequate protein is essential.
Insufficient protein intake may contribute to slower nail growth or weaker nails.
Good protein sources include:
- Eggs
- Fish
- Chicken
- Turkey
- Lean beef
- Greek yogurt
- Cottage cheese
- Beans
- Lentils
- Chickpeas
- Tofu
- Tempeh
- Nuts
- Seeds
Aim to include a quality protein source with each meal.
2. Biotin (Vitamin B7)
Biotin is one of the nutrients most commonly associated with nail health.
Several small studies suggest that biotin supplementation may improve nail thickness and reduce brittleness in some people who have fragile nails. However, larger, high-quality studies are still needed, and not everyone benefits from supplementation.
Natural food sources include:
- Eggs (fully cooked)
- Almonds
- Walnuts
- Peanuts
- Sunflower seeds
- Sweet potatoes
- Mushrooms
- Salmon
- Avocados
Most people obtain adequate biotin through a varied diet.
An important note: High-dose biotin supplements can interfere with certain laboratory tests, including some thyroid and heart-related blood tests. If you take biotin supplements, inform your healthcare provider before blood work.
3. Iron
Iron helps transport oxygen throughout the body.
Low iron levels may contribute to fatigue and, in some cases, changes in nail appearance.
One nail change associated with significant iron deficiency is spoon-shaped nails, known medically as koilonychia.
Iron-rich foods include:
- Lean red meat
- Liver (in moderation)
- Poultry
- Seafood
- Lentils
- Beans
- Spinach
- Pumpkin seeds
- Fortified breakfast cereals
Vitamin C helps improve absorption of plant-based iron.
Pair iron-rich foods with:
- Oranges
- Strawberries
- Bell peppers
- Tomatoes
- Kiwi
- Broccoli
Do not begin iron supplements unless advised by a healthcare professional, as excessive iron can be harmful.
4. Vitamin B12
Vitamin B12 supports healthy red blood cells and normal nerve function.
Deficiency may contribute to fatigue, anemia, and occasionally changes in nails or skin.
Foods naturally rich in B12 include:
- Beef
- Fish
- Shellfish
- Eggs
- Milk
- Cheese
- Yogurt
People following vegetarian or vegan diets may need fortified foods or supplements, depending on their individual needs.
5. Zinc
Zinc plays an important role in cell growth and tissue repair.
Because nails grow continuously, adequate zinc supports the body’s ability to produce new nail cells.
Good sources include:
- Oysters
- Beef
- Pumpkin seeds
- Cashews
- Chickpeas
- Lentils
- Whole grains
- Dairy products
Severe zinc deficiency can sometimes affect nail growth, although it is uncommon in people eating a balanced diet.
6. Omega-3 Fatty Acids
Healthy fats support skin hydration and may help maintain nail flexibility.
Foods rich in omega-3 fatty acids include:
- Salmon
- Sardines
- Mackerel
- Trout
- Chia seeds
- Flaxseeds
- Walnuts
These foods also support heart and brain health.
