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49, 95 % CI 0.98-2.26 for 25-49 nmol/L; OR 1.37, 95 % CI 0.65-2.88 for less then 25 nmol/L). Among the components of frailty, low grip strength was significantly associated with lower serum levels of vitamin D. CONCLUSIONS Low serum levels of vitamin D are associated with an increased likelihood of frailty in community-dwelling older adults, suggesting a potentially protective role of vitamin D against frailty. BACKGROUND Physical multimorbidity, defined as the presence of two or more chronic physical conditions, is widespread and redu