If you've researched bone health supplements, you've probably encountered strontium citrate.
Some people swear by it as a bone-building breakthrough. Others dismiss it as overhyped or even dangerous. As with most polarized health topics, the truth is more nuanced than either side suggests.
At Sōlaria Biō, we believe you deserve the full story.
Strontium ranelate (a prescription drug in Europe) has been shown to reduce spine fractures but carries cardiovascular risks. Strontium citrate (the supplement available in the U.S.) has no clinical evidence showing fracture reduction, and it can artificially inflate bone density scan results.
Let's look at what the research actually shows about strontium: what it does, what it doesn't do, and what you should know if you're considering it for your bones.
Strontium Citrate vs. Strontium Ranelate: Two Very Different Evidence Bases
When people talk about strontium for bones, they're usually referring to one of two forms: strontium ranelate (a prescription medication available in Europe) or strontium citrate (the supplement you can buy over the counter in the US). These are not interchangeable, and the research on each is dramatically different.
What is Strontium Ranelate?
Strontium ranelate has been studied in large, multi-year trials. In women past menopause who had weak bones, taking 2 grams per day reduced spine fractures by roughly 31-40%. The effects on other fractures (hips, wrists) were smaller and less consistent. Still, a reduction in spine fractures is a real, meaningful benefit.
But strontium ranelate also comes with real risks. Studies found it increased the risk of heart attacks by about 60% and blood clots in the veins by roughly 30%. Rare but serious skin reactions have also been reported.
Because of these safety concerns, European regulators now restrict strontium ranelate to people with severe bone loss who can't use other treatments and who don't have heart problems or uncontrolled high blood pressure. If prescribed, doctors are advised to monitor heart health regularly.
What is Strontium Citrate?
Strontium citrate, by contrast, has essentially no rigorous clinical research behind it.
Recent reviews make this explicit: there are no well-designed studies showing that over- the-counter strontium supplements reduce fracture risk. There are also no safety studies for strontium citrate. As one research review bluntly put it, "there is no data on the safety of short or long-term use of strontium citrate."
In short, we don’t yet know if strontium citrate is safe or may have harmful associations like its cousin strontium ranelate, but assuming that a prescription drug's effects apply to an unregulated supplement is a big leap.
Does Strontium Artificially Increase Bone Density on a DEXA Scan?
One of the most important—and widely misunderstood—issues with strontium is how it affects bone density test results.
Here's what happens: Strontium is chemically similar to calcium, so when you take it, it gets built into your bones in place of some calcium. But strontium atoms are heavier than calcium atoms. When you get a bone density scan (such as a DEXA scan), the machine sends X-rays through your bones. Heavier atoms block more X-rays. So, bones with strontium in them look denser on the scan—even if they're not actually stronger.
With strontium citrate, better numbers don't mean stronger bones.
How much does this matter? For every 1% of strontium that gets built into your bones, the scan overestimates your bone density by about 10%. Some analyses suggest that up to 75% of the bone density increase people see with strontium ranelate is this measurement artifact—not real gains in bone strength.
This measurement problem applies to any form of strontium that gets into your bones, including strontium citrate supplements. People who've taken strontium citrate report bone density increases of 8–10% over several years, but those numbers drop when they stop taking it—consistent with strontium leaving the bones, not with real bone rebuilding. And because strontium can stay in bones for years, the inflated test results can persist long after you stop supplementing.
Here's the bottom line: bone density numbers on strontium aren’t a reliable measure of bone strength.
The only way to know if strontium prevents fractures is to track actual broken bones, and for strontium citrate, we have no fracture data.
Are Strontium Citrate Supplements Safe to Take?
The safety picture for strontium ranelate is well-documented through years of research and real-world tracking. The heart and blood clot risks are real; that's why regulators put strict limits on who can use it.
For strontium citrate, we simply don't know.
There are no published studies on heart safety, blood clots, systematic skin reactions, or kidney side effects. Without this research, we can't confidently say whether strontium citrate is safe—especially for long-term use.
This matters because dietary strontium is very efficiently absorbed and incorporated into your bones by displacing calcium. This strontium then stays there for years. In lab studies, too much strontium has been linked to a defective bone formation similar to a condition called osteomalacia. And while strontium citrate supplements deliver a lower dose than strontium ranelate (about 680 mg versus 2,000 mg per day), we don't have research showing whether that lower dose is actually safer.
Is Strontium Recommended for Preventing Fractures?
If you're considering strontium supplementation for bone health, here's what the evidence supports:
Strontium Ranelate
- It’s been shown to reduce spine fractures in research studies, but it comes with real heart and blood clot risks that require careful screening and monitoring.
- It's restricted to people with severe bone loss who can't use other treatments and don't have heart problems.
- It's not available in the United States.
Strontium Citrate
- It has no clinical research showing it prevents fractures and no safety studies.
- The bone density improvements people report with strontium citrate are likely inflated by the measurement problem we described earlier—they can't be taken as proof it actually works.
- The current research does not support taking strontium citrate for preventing fractures or as a replacement for proven treatments.
To be clear: this isn't a blanket dismissal of strontium citrate. Strontium does get into bones, and lab studies suggest it might affect how bone breaks down and rebuilds.
However, for strontium citrate, the evidence for this benefit in a clinical setting is simply not established.
What’s the Best Alternative to Strontium for Bone Health?
At Sōlaria Biō, we focus on what others overlook—and one of those overlooked truths is that bone health is deeply connected to inflammation, especially inflammation that starts in the gut. Chronic, low-level inflammation speeds up bone breakdown and interferes with bone building. Addressing that underlying problem is a more direct path to protecting bones than adding minerals that make your test results look better without actually strengthening bone.
Our lead product, Bōndia, takes a different approach. It's a synbiotic (a combination of probiotics and prebiotics) containing four proprietary bacterial strains designed to strengthen the gut barrier, reduce inflammatory signals, and slow the activity of the cells that break down bone. In a year-long study of 286 postmenopausal women, Bōndia reduced bone loss by 85% at the femoral neck in women with osteopenia. And it was safe, with no difference in side effects between the Bōndia group and the placebo group.
That's the standard we believe bone health deserves: rigorous research and solutions grounded in understanding why bone loss happens in the first place.
FAQs About Strontium Citrate and Bone Health
Q: Does strontium citrate increase bone density?
It can increase DEXA scan readings, but much of that increase may reflect measurement artifact rather than true bone strengthening.
Q: Does strontium citrate prevent fractures?
There are no clinical trials showing that over-the-counter strontium citrate reduces fracture risk.
Q: Is strontium citrate safer than strontium ranelate?
We don’t know. There are no long-term safety studies evaluating strontium citrate.
