What Those Vertical Ridges on Your Fingernails Might Be Telling You — Especially After 40

Another common factor is lack of essential vitamins and minerals, especially:

Biotin (Vitamin B7)
Iron
Zinc
Magnesium
As we age, our bodies don’t absorb nutrients as efficiently. That means even if you’re eating well, you might still fall short in certain areas — and your nails could be one of the first places to show it.