What Vitamin Deficiency Causes Nails to Curl Inwards?
•
4 min read
According to the National Institutes of Health, iron deficiency is the world's most common nutritional deficiency and is the most frequent cause of koilonychia, the specific nail condition where nails curl inwards. This unusual symptom often signals an underlying health issue rather than just a cosmetic concern, and correcting the vitamin deficiency can help reverse the condition.
