Co som nasiel:

White lines or spots can be a sign of a zinc or iron deficiency or protein deficiency.
Thin flat nails may indicate a B12 deficiency
Ridged nails may indicate an iron deficiency
Frequent hangnails may indicate a Vitamin C deficiency
Yellowish nails may indicate a B12 deficiency or may indicate diabetes, allergies, liver problems

A tiez ze by si mala kontrolovat ci mas dost vapnika, zinku a magnezia.