The use of strontium for osteoporosis management today is narrow. The prescription drug strontium ranelate reduces vertebral fractures, but it raises the risk of heart attack and blood clots. Regulators therefore limited it to severe osteoporosis in patients who cannot take anything else, and the original branded product was later withdrawn. Over-the-counter strontium supplements are a different thing altogether and have no proven fracture benefit.
Below I explain how strontium acts on bone, why its use collapsed, how it affects bone density scans, and what to discuss with your doctor if you are thinking about it.
What Is Strontium and How Does It Act on Bone?
Strontium is a trace element found naturally in seawater, soil, and small amounts in food. Chemically it sits just below calcium in the periodic table, so the body handles it in a similar way. Strontium that is absorbed can be built into the mineral crystals of bone, taking the place of some calcium.
The prescription form, strontium ranelate, was developed as a daily oral osteoporosis drug. It was described as having a “dual action”:
- Anabolic effect: it encourages pre-osteoblasts (bone-building precursor cells) to mature and lay down new bone.
- Anti-resorptive effect: it dampens the activity of osteoclasts, the cells that break bone down.
Most osteoporosis drugs do one or the other. Because strontium seemed to do both, it drew a lot of attention when it first came out. In practice, the anabolic effect in people was modest, and much less than that of true bone-building drugs such as teriparatide.
Osteoporosis: The Condition Strontium Was Meant to Treat
Osteoporosis is a bone disease in which bone is broken down faster than it is rebuilt. Bones lose both mass and internal structure, and they break under loads a healthy skeleton would easily withstand.
The main risk factors are age, falling estrogen after menopause, a family history of hip fracture, low calcium and vitamin D intake, smoking, heavy alcohol use, inactivity, and long-term glucocorticoid (steroid) treatment. The disease is usually silent until a fracture happens. Warning signs include loss of height, a stooped posture, and sudden back pain from a vertebral compression fracture.
Diagnosis rests on a DXA scan (dual-energy X-ray absorptiometry). The result is reported as a T-score, which compares your bone density with that of a healthy young adult.
| T-score | Classification |
|---|---|
| -1.0 or higher | Normal bone density |
| Between -1.0 and -2.5 | Osteopenia (low bone mass) |
| -2.5 or lower | Osteoporosis |
| -2.5 or lower plus a fragility fracture | Severe (established) osteoporosis |
Clinicians often add the FRAX® tool, which estimates your 10-year fracture probability, to decide whether treatment is warranted.
Strontium Ranelate vs Strontium Supplements
This is the distinction that matters most. Patients sometimes read about strontium ranelate and then buy strontium citrate from a health-food store, thinking it is the same drug. It is not.
| Feature | Strontium ranelate | Strontium citrate / carbonate supplements |
|---|---|---|
| Status | Prescription medicine (some countries only) | Sold over the counter as a dietary supplement |
| Fracture evidence | Large trials showed fewer vertebral fractures | No trials showing fewer fractures |
| Dose control | Standard daily dose of 2 g | Varies by brand; not standardized |
| Safety monitoring | Known cardiovascular and clot risks, regulated warnings | Safety not systematically studied |
| US availability | Never approved by the FDA | Widely sold |
If you are considering any supplement for bone health, my article on supplements in osteoporosis management covers which ones actually have evidence behind them. Calcium and vitamin D remain the foundation; strontium is not a replacement for either.
Why Strontium Fell Out of Favor
Strontium ranelate did reduce vertebral fractures in its original trials, with smaller benefits at non-vertebral sites. The problems appeared once it was used widely.
- Heart attack risk: pooled data showed more myocardial infarctions in people taking the drug than in those taking placebo.
- Venous thromboembolism: deep vein thrombosis and pulmonary embolism occurred more often.
- Serious skin reactions: rare but dangerous hypersensitivity reactions, including DRESS (drug rash with eosinophilia and systemic symptoms), were reported.
- Gastrointestinal effects: nausea and diarrhea were common, especially early on.
In response, European regulators restricted its use to severe osteoporosis in patients at high fracture risk who could not use other approved drugs. They also barred it for anyone with ischemic heart disease, peripheral arterial disease, cerebrovascular disease, uncontrolled high blood pressure, or a history of blood clots. The original branded product was then withdrawn by its manufacturer in 2017. It was never approved in the United States.
At the same time, better options arrived. Today’s osteoporosis drug therapy includes bisphosphonates, denosumab, and true anabolic agents such as teriparatide, abaloparatide, and romosozumab. These give stronger or safer fracture protection, so strontium has very little remaining niche.
How Strontium Distorts Bone Density Scans
Strontium is a heavier atom than calcium, so it absorbs more X-ray energy. When it is built into bone, a DXA scan reads the bone as denser than it truly is. Much of the apparent rise in bone density on strontium therapy is this measurement artifact rather than real new bone.
This has practical consequences:
- Tell whoever performs your DXA scan if you have ever taken strontium, including supplements.
- A rising T-score on strontium does not necessarily mean your fracture risk has fallen by the same amount.
- After stopping strontium, the artifact fades slowly, so scans can seem to “drop” even when the skeleton has not changed.
Where Strontium Fits in a Treatment Plan Now
For most people, strontium is not a first-line, second-line, or even third-line option. Standard care follows a stepwise approach:
- Correct calcium and vitamin D intake, stay active with weight-bearing and resistance exercise, prevent falls, stop smoking, and limit alcohol.
- Start an oral bisphosphonate such as alendronate or risedronate if treatment is indicated.
- If oral tablets are not tolerated or not suitable, consider an intravenous bisphosphonate or denosumab. My guide to infusion therapies for osteoporosis covers these in detail.
- For very high fracture risk, a bone-building (anabolic) agent is often used first, followed by an anti-resorptive drug to hold the gains.
Strontium ranelate may still come up in countries where generic versions exist. It is used only for a patient with severe osteoporosis who cannot take any of the above and has a clean cardiovascular history. For the broader picture of where research is heading, see current strategies and future directions in osteoporosis, or start from our osteoporosis guide.
Key Takeaways
- Strontium ranelate lowered vertebral fracture risk but raised the risk of heart attack, blood clots, and serious skin reactions.
- It was restricted to severe cases with no alternative, then withdrawn in its original branded form; it was never FDA-approved.
- Over-the-counter strontium supplements are not the same drug and have no proven fracture benefit.
- Strontium inflates DXA readings, so always tell your scan team if you have taken it.
- Bisphosphonates, denosumab, and anabolic agents are the evidence-based choices for most patients.
Frequently Asked Questions
Is strontium still prescribed for osteoporosis?
Rarely. In some countries generic strontium ranelate remains available, but guidelines reserve it for severe osteoporosis when every other option is unsuitable. The patient must also have no history of heart disease, stroke, peripheral arterial disease, or blood clots.
Can I take strontium citrate supplements instead of prescription medication?
I would not recommend it. Strontium citrate has not been shown to prevent fractures, doses are not standardized, and its safety has not been properly studied. It will also falsely raise your bone density readings, which can hide real bone loss.
Should I take strontium with calcium?
No, not at the same time. Calcium and food sharply reduce strontium absorption, which is why strontium ranelate was taken at bedtime, at least two hours after eating. Anyone on strontium still needs adequate calcium and vitamin D, taken at a different time of day.
Why did my bone density jump so much on strontium?
Much of that jump is an artifact. Strontium is heavier than calcium and looks denser on X-ray, so DXA overestimates true bone density. Your doctor should read your scans with this in mind.
What are the warning signs of a serious reaction to strontium?
Seek urgent care for chest pain, shortness of breath, or a painful, swollen leg, since these may signal a heart attack or blood clot. A spreading rash with fever or swollen glands can be a severe allergic reaction and needs immediate attention.
