• What nutritional deficiencies and toxic exposures are associated with nail changes? 

    Jacobsen, Emily; Blenning, Carol E.; Judkins, Dolores Zegar (Family Physicians Inquiries Network, 2012-03)
    Infants with iron deficiency have a higher rate of koilonychia—concavity of the outer surface of the nail—(strength of recommendation [SOR]: C, one case-control study). Vitamin B12 deficiency is associated with various ...