Weak or soft nails are one of the most common nail problems due to vitamin deficiency. These nails typically bend or break easily. In most cases, deficiency in essential vitamins and minerals such as B vitamins, iron, calcium, and fatty acids is the primary cause of the problem.

Weak, brittle nails that chip easily can signal deficiencies in biotin, zinc, or protein. Biotin is particularly important for nail growth, while zinc and protein support overall nail strength.

Chipped nails, brittle nails, or nails with darkened linings may have been a familiar sight for many and are signs of vitamin deficiency in nails. 1 Signs like these often indicate Vitamin D deficiency, iron deficiency, or even both. One crucial part of our body which helps us understand underlying deficiencies or abnormalities is the nails.