B12 deficiency: Protein pump inhibitors may double B12 deficiency risk | Express.co.uk
Molecola di idrossicobalamina vitamina B12. Spesso somministrato terapeuticamente in caso di deficit di B12. Formula scheletrica stilizzata (struttura chimica): Atomi ar Foto stock - Alamy
Deficiency of vitamin B12 and its relation with neurological disorders: a critical review | The Journal of Basic and Applied Zoology | Full Text
Vitamin B12 deficiency | The BMJ
Causes and Early Diagnosis of Vitamin B12 Deficiency (03.10.2008)