Vitamin D and Fall Prevention in Older Adults: Evidence Review

Not definitively. Two meta-analyses of randomized trials found that daily vitamin D at about 700-1,000 IU was associated with a modestly lower fall risk in older adults (relative risk about 0.85-0.87 ^[1][2]), but the absolute differences were small and the benefit was concentrated in people who were vitamin D deficient. It is more accurate to say vitamin D is 'associated with lower fall risk in meta-analyses' than to call it a proven way to prevent falls.

The protective signal appeared at roughly 700-1,000 IU (17.5-25 mcg) per day. Doses below 700 IU/day were not significantly effective, and a 2024 analysis found that daily doses above 1,000 IU were associated with more falls, not fewer ^[1]. For context, NIH ODS sets the recommended intake at 800 IU (20 mcg)/day for adults over 70, with a tolerable upper intake level of 4,000 IU (100 mcg)/day - those figures describe adequate intake and safety, not a fall-prevention dose.

Older adults who are vitamin D deficient (serum 25(OH)D at or below 50 nmol/L) showed the clearest reduction in falls; those already above 50 nmol/L saw little benefit ^[1]. Daily dosing was associated with benefit, while large intermittent (for example, monthly) doses were not.

No. Vitamin D is not a substitute for a fall-risk evaluation, balance and strength (resistance) training, medication review, vision checks, or home-hazard reduction, which are the mainstays of fall prevention. Correcting a confirmed vitamin D deficiency may be a helpful addition, ideally guided by a clinician and a blood test.

No. While two meta-analyses suggest a possible lower fall risk at certain daily doses, this does not mean everyone should supplement solely for fall prevention. Preventive-care guidance is generally cautious about recommending routine vitamin D purely to prevent falls in healthy, community-dwelling older adults - the benefit in these analyses was small and seen mainly in people who were vitamin D deficient. The priority remains a fall-risk evaluation, balance and strength training, medication review, vision correction, and home-safety changes, with vitamin D individualized to the person - especially those with deficiency, osteoporosis, malabsorption, kidney disease, a risk of hypercalcemia, or medications affecting vitamin D or calcium metabolism.