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.
Good dietary sources of biotin include:
- 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.

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