New Study Debunks Myth: Calcium Supplements Don’t Raise Dementia Risk
Calcium Supplements Not Linked to Dementia Risk
New research shows calcium supplements are not linked to dementia risk in older women. Learn how they support bone health safely and effectively.
For millions of older women, calcium supplements are a non-negotiable part of their daily routine—a first line of defense against osteoporosis and debilitating fractures. But in recent years, a worrying question has lingered in the minds of patients and clinicians alike: Could this habit be harming my brain?
Earlier observational studies had suggested a potential link between calcium supplementation and an increased risk of dementia, causing confusion and concern. However, a landmark new study published in October 2025 in The Lancet Regional Health – Western Pacific provides the most definitive answer to date: Calcium supplements do not increase the long-term risk of dementia.
Here is what you need to know about this reassuring study and what it means for your bone—and brain—health.
The Origin of the Concern
To understand why this new study is so important, we have to look back at why the concern existed in the first place.
The worry stemmed largely from observational research, including a 2016 Swedish study that suggested older women with cerebrovascular disease who took calcium supplements had a slightly higher risk of dementia. The theoretical mechanism was plausible: some scientists hypothesized that a sudden influx of calcium could lead to “calcium overload” in cells or promote deposits in the brain’s vasculature.
However, these earlier studies were “observational.” They could show a link, but they couldn’t prove cause and effect. They were often plagued by confounding factors—meaning the women taking supplements might have had different health profiles than those who didn’t, which skewed the results.
Inside the 2025 Study: A Gold-Standard Investigation
A team of researchers from Edith Cowan University (ECU), Curtin University, and the University of Western Australia set out to get a clear answer by looking at data that is far more reliable than standard observation: a randomized controlled trial (RCT)
They conducted a post-hoc analysis of the Calcium Intake Fracture Outcome Study (CAIFOS), a five-year, double-blind, placebo-controlled trial. This is the “gold standard” of medical research design.
- The Participants: 1,460 community-dwelling women aged 70 and older who were dementia-free at the start.
- The Method: Half of the women received 1,200 mg of elemental calcium (as calcium carbonate) daily for five years. The other half received a placebo.
- The Follow-Up: Crucially, the researchers didn’t stop there. They followed the women for an additional 9.5 years, bringing the total follow-up time to a remarkable 14.5 years.
The Results: No Increased Risk
After nearly a decade and a half of follow-up, 269 women had dementia-related events (hospitalizations or deaths). When the researchers crunched the numbers, the verdict was clear.
Compared to the placebo group, the women who took calcium supplements showed no increased risk of developing dementia.
- The Hazard Ratio (HR) for all-cause dementia was 0.90. While this slightly favored the calcium group, it was not statistically significant, meaning the supplements were neither harmful nor beneficial—they were neutral
- These results held true even when the researchers adjusted for lifestyle factors, dietary calcium intake, and genetic risk (like the APOE gene), and even when looking specifically at women who adhered strictly to their supplement regimen.
What the Experts Are Saying
The research community has greeted these findings as a significant step forward in separating myth from fact.
Dr. Marc Sim, Senior Research Fellow at ECU and a study author, emphasized the strength of this new data compared to the old. “Previous research suggesting potential links between calcium supplement use and the risk for dementia was purely observational in nature,” he explained. “Our research… reduces the likelihood of unmeasured confounding”.
Professor Blossom Stephan, a Dementia Australia Honorary Medical Advisor, noted that the research provides “reassurance to clinicians and patients about the long-term safety of calcium supplementation.n”
This consensus is vital because fear of dementia might have led some patients to abandon supplements that are critical for preventing osteoporotic fractures—a major cause of disability and loss of independence in older age
What This Means For You
This study offers a strong “all clear” for the primary demographic concerned about this issue: older women.
For Bone Health: You can continue taking calcium supplements as prescribed or recommended for osteoporosis prevention without the fear that you are harming your cognitive future. The benefits for your skeleton remain well-established.
For Brain Health: The theoretical risk of calcium supplements causing dementia appears to be spurious. As the researchers put it, the findings “do not support concerns that calcium supplementation increases long-term risk of dementia”.
Important Caveats and A Look Ahead
While this study is the most rigorous to date, it has limitations that researchers are keen to highlight.
- Demographic Limits: The study was conducted exclusively in older white women. The results cannot be automatically generalized to men, younger women, or other ethnic groups.
- Monotherapy Focus: The study looked at calcium on its own (monotherapy). While combination calcium-vitamin D supplements are common and generally considered safe, this specific study didn’t evaluate them for dementia risk, though other RCTs have found no increased risk with the combination either.
- Ongoing Research: Scientists agree that future clinical trials should be designed specifically to look at brain health as a primary outcome, and should include more diverse populations.
The Bottom Line
The myth that calcium supplements might raise dementia risk has been effectively debunked by high-quality, long-term data. For the millions of women relying on these supplements to maintain their mobility and skeletal strength, this news is a welcome relief.
As always, you should consult with your healthcare provider or pharmacist to ensure that any supplement regimen is right for your personal health profile. But when it comes to calcium and cognition, the evidence now suggests you can take that tablet with confidence.
Reference:
https://www.medicalnewstoday.com/articles/daily-calcium-supplements-not-linked-to-dementia
https://www.sciencedirect.com/science/article/pii/S2666606525002330
https://www.pharmacytimes.com/view/data-reinforces-that-calcium-supplementation-is-not-linked-to-dementia-risk-in-older-women
Medications that have been suggested by doctors worldwide are available on the link below
https://mygenericpharmacy.com/category/disease/alzheimer-disease
Disclaimer: This blog post is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional before making any decisions about your health or supplement regimen.




