Do Calcium and Vitamin D Supplements Actually Prevent Fractures and Falls?

A Sweeping Review Challenges Routine Supplementation

The research examined data from more than 153,000 adults across 69 randomized controlled trials and found that the supplements, whether taken alone or combined, do little to prevent fractures or falls.

The widespread clinical practice of prescribing or recommending routine supplementation for older populations is largely unsupported by the data. Falls remain a major public health concern, with nearly one in three adults aged 65 and older taking a fall each year. These incidents frequently lead to chronic pain, fractures, a loss of independence, reduced quality of life, and sometimes admission to residential care facilities.

Analyzing Data From 153,902 Participants

To evaluate whether the supplements work, researchers in Canada analyzed results from 69 randomized controlled trials involving 153,902 participants. Randomized controlled trials are considered among the strongest methods for testing medical treatments because participants are assigned to different groups to minimize external variables. The studies compared calcium supplements, vitamin D supplements, or a combination of both against a placebo or no treatment.

After establishing thresholds for what constitutes a clinically meaningful benefit, the team found negligible effects on the likelihood of experiencing any fracture. For calcium supplements alone, the conclusion relied on moderate certainty evidence from 11 trials encompassing 9,067 participants. For vitamin D supplements alone, researchers assessed high certainty evidence from 36 trials covering 92,045 participants.

Consistent Results Across Fractures and Falls

When evaluating calcium and vitamin D taken together, high certainty evidence from 15 trials involving 51,126 participants similarly showed little to no meaningful effect. The researchers observed the same general pattern when focusing specifically on hip fractures and falls. Calcium, vitamin D, and combined regimens all showed little to no impact, with the supporting evidence rated as moderate to high certainty.

The study results remained consistent even after researchers accounted for age, sex, previous falls, prior fractures, and the average amount of calcium participants consumed through their regular diet. That consistency gives researchers greater confidence in the overall conclusions, though they note that certain sub-analyses relied on smaller numbers of trials.

Targeted Care and Alternative Strategies

Despite the broad findings, the study authors emphasize that certain groups require different care. People diagnosed with specific bone disorders or those actively receiving prescription medications for osteoporosis may have distinct medical needs and should not assume the new review applies directly to them.

Based on the data, the researchers state that the evidence does not support routine supplementation with calcium or vitamin D, or combined supplementation to prevent fractures and falls.