If such lines appear on your nails after the age of 40, it’s a clear sign that…

Adopt a balanced diet rich in vitamins A, C, and B, as well as minerals like zinc and iron. Use gentle nail products and avoid excessive filing and harsh manicures.

Consider taking biotin supplements (consult your doctor first).

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At 18, she seemed to be in perfect health, but a small hidden spot in her hair told a completely different story.