Eggshell nails are caused by nutritional deficiencies, medications, and stress. Eggshell nails are thin, brittle nails that are often white in color and naturally rounded. Experts at Instah suggest that eggshell nails can be the result of a damaged matrix.
Stress and pharmaceutical medications can affect the nail bed adversely and cause the matrix to produce thin and brittle nails. Vitamins C, B7, B12, and essential fatty acids boost nail production and nourish the nail bed. WebMD recommends the daily use of Vitamin E oil on cuticles to keep nails strong and healthy, but proper diet and stress reduction is the key to healthy nails.