2. Biotin (Vitamin B7): The Nail-Strengthening Nutrient
Biotin is one of the most well-known nutrients for nail health. Studies suggest that biotin supplementation may improve brittle nails, but many people can get enough from food alone.
Eggs (fully cooked)
Almonds and walnuts
Sweet potatoes
Spinach
Salmon
Biotin supports keratin structure, helping nails grow thicker and less prone to ridging caused by fragility.
3. Iron: Preventing Weak or Grooved Nails
Iron deficiency can lead to thin nails and, in more severe cases, spoon-shaped nails (koilonychia). While vertical ridges alone don’t automatically mean iron deficiency, persistent weakness or fatigue alongside nail changes may be worth discussing with a healthcare provider.
Iron-rich foods include:
