A study in 2021 discovered 32 species of bacteria and 28 species of fungi under fingernails. Maintaining healthy fingernails requires good hygiene, balanced diet, and proper care. Nutrition with biotin, vitamins A, C, D, and E, as well as minerals like iron and zinc, supports overall nail health. Adequate hydration and careful handling of nails are also important. Maintaining healthy fingernails involves a combination of good hygiene, a balanced diet, and proper nail care practices.