Low levels of crucial nutrients like biotin, iron, zinc, or magnesium can cause weaker, ridged nails. Since metabolism and nutrient absorption may diminish with age, deficiencies become more likely after 40.
Health Conditions
In some cases, vertical ridges may imply health issues such as poor circulation, thyroid imbalance, or even rheumatoid arthritis. If you spot other symptoms like fatigue, brittle hair, or changes in skin texture, it’s worth visiting a doctor.
When Should You Worry?