Are Calcium and Vitamin D Enough for Bone Health?
July 15, 2026by Anna Zucker
WASHINGTON — Millions of older adults take a calcium or vitamin D pill every morning, trusting it will help keep their bones strong. It’s a habit passed down for decades, backed by doctors, pharmacists and health guidelines alike. But not every long-standing health habit holds up the same way once someone goes back and checks the evidence
Researchers set out to do exactly that, pulling together decades of clinical trial data to see whether these supplements deliver on their promise. Here’s everything you need to know about the findings
Calcium, Vitamin D, or Combined Supplementation to Prevent Fractures and Falls: Systematic Review and Meta-Analysis
For a supplement routine millions of people take, calcium and vitamin D have surprisingly little evidence supporting them. Researchers had their new review published in the BMJ Journal in June 2026. The goal was to determine whether calcium, vitamin D, or both reduce the risk of fractures and falls in adults.
Let’s break it down
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ParticipantsThe review pooled data from 69 randomized controlled trials involving 153,902 participants. The median age across trials was 71.2 years, and 84% of the trials had a mean participant age of at least 65. About 38% of trials recruited women only. Most trials (87%) included only community-dwelling adults, and 73% of trials involved people who were not considered at high risk of fractures or falls to begin with
Study DesignThis was a systematic review and meta-analysis, meaning researchers combined and re-analyzed data from existing trials. Trials compared calcium supplements, vitamin D supplements, or both combined with a placebo or no treatment.
The median follow-up period across trials was 2.0 years. Researchers rated the certainty of the evidence using the GRADE system, a standardized method for assessing the confidence in a set of findings
ResultsCalcium supplementation alone was found to have little to no effect on the risk of any fracture, based on moderate-certainty evidence from 11 trials and 9,067 participants.
Vitamin D supplementation alone showed the same pattern, with high-certainty evidence from 36 trials and 92,415 participants.
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