Iron supports healthy hair and nail growth. A deficiency can cause thinning hair, brittle nails, or spoon-shaped nails (koilonychia). Oxygen deprivation caused by iron deficiency may lead to dry ...

Spoon nails are mostly due to something else: "This is usually a sign of iron deficiency anemia," said Dr. Jaliman. "It can be treated with iron supplements." You might have nail pitting if you ...