Background Hip fractures (HF) are a high-impact geriatric syndrome. Vitamin B12 deficiency is an HF risk factor. There are few studies on prevalence of B12 deficiency in older adults with HF. The objectives are as follows: in older adults with HF, to describe/characterize plasma levels of vitamin B12 (PL-B12); to verify presence/absence of a subgroup with borderline, near-deficient PLB12; to describe HF incidence; and to analyse relationships between PL-B12 and studied variables.