Iron
Iron helps transport oxygen to the foundation, which can support nail growth. Iron deficiency can cause brittle or conical nails. There will be many in meat, dark green leafy vegetables, beans, and grains.
Vitamin C
Vitamin C plays an antioxidant role and is necessary for the body's collagen production to support the development of hair, teeth and nails.

Citrus fruits, tomatoes, potatoes, bell peppers, and broccoli are all rich sources of vitamin C.
Vitamin B12
Vitamin B12 plays an important role in the production of red blood cells. These cells carry oxygen to tissues, including nails. Foods rich in vitamin B12 include meat, fish, milk, and nutrients.
Calcium
A lack of calcium can cause nails to dry, break or brittle. In addition to keeping nails strong, calcium also plays an essential role in nerve, muscle and hormone health. Foods rich in calcium such as green leafy vegetables, seafood, and cottage cheese.

Zinc
Zinc deficiency can cause nail health problems such as white spots, slow-growing nails or thinning nails. Foods rich in zinc include red meat, poultry, wheat germ, nuts, nuts, cashews and almonds.