Nails, Rounded With Curved Ends

What Are Rounded Nails With Curved Ends?
[dropcap]R[/dropcap]ounded, curved, dark and dry nails are a well known feature of vitamin B12 deficiency.
Q: How does vitamin B12 deficiency cause the nails to grow this way?
A: Vitamin B12 deficiency affects the nail plate. The nail plate is the hard keratin cover of the finger tip and toe tip, simply called “the nail.” The nail plate is produced by the living nail matrix at its base.