Strontium

Also known as: Strontium citrate, Strontium ranelate, Strontium salts

A calcium-like element sold for bone support, where supplement salts must not be confused with the restricted medicine strontium ranelate.

Editorial review by the IngredientWiki Editorial Team
Updated 2026-09-28
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Hand-colored geological study of pale blue celestine crystals — Editorial illustration

Strontium is an element chemically similar to calcium. Supplemental strontium citrate is marketed for bone health, but trials often combine it with other nutrients and cannot isolate its effect. Strontium ranelate is a different prescription medicine restricted in Europe because of cardiovascular and other risks; its efficacy data and dosing cannot be transferred to over-the-counter citrate products.^{2, 3, 4}

Not an essential nutrient with a U.S. daily value^{1, 4}
Citrate and ranelate are different interventions^{1, 4}
Strontium can artificially raise DXA bone-density readings^{1, 4}
Prescription ranelate has important safety restrictions^{1, 4}

What is Strontium?

Because strontium atoms attenuate X-rays more strongly than calcium, incorporation into bone can increase measured density beyond the change in bone mineral quantity. That complicates interpretation of DXA scans during supplementation.^{1, 4}

Where it comes from

Natural sources

Rocks, soil, water, and trace amounts in food
Naturally incorporated into bone at low levels

How it's made

Supplements and medicines use manufactured salts such as citrate or ranelate.

What it does in products

Benefits

Bone density with strontium citrate combinations

limited evidence

One randomized trial reported bone-density changes from a multi-nutrient program that included strontium citrate.^{2, 4}

The combined intervention prevents attribution to strontium, and DXA readings are influenced by the element's X-ray properties.

Fracture prevention from supplements

insufficient evidence

Evidence for prescription strontium ranelate does not establish that retail citrate supplements prevent fractures.^{3, 2}

The salts, dose, regulatory oversight, and safety monitoring are different.

Evidence scope and limitations

Oral citrate supplements are distinguished from prescription ranelate and environmental radioactive strontium.

Supplement trials are commonly multi-ingredient.
DXA is biased upward when strontium replaces calcium in bone.
Long-term citrate safety is not well established.

Evidence last checked: 2026-09-28

Side effects & safety

Digestive upset or headache (uncommon)Reported with oral salts.

Cardiovascular and clot risk (varies)A major concern for prescription strontium ranelate; supplement safety is less well characterized.

Safety considerations

Avoid supplemental strontium during pregnancy and breastfeeding unless medically directed.
Calcium supplements and calcium-rich meals may compete for absorption
Tetracycline and quinolone antibiotics
Not for: Cardiovascular or thromboembolic disease without clinician review
Not for: Kidney disease
Not for: Using supplement data to interpret DXA without telling the imaging clinician

^{3, 4}

Amounts studied & product use

These figures describe research or common product use, not a personal dose or treatment recommendation.

In supplement studies and products

No U.S. recommended dietary allowance exists. Combination studies use product-specific citrate doses, while ranelate dosing is not transferable to supplements.

^{2, 3}

Regulatory status

Strontium citrate is sold as a dietary supplement but is not FDA-approved to prevent fractures; strontium ranelate is not an FDA-approved osteoporosis drug in the United States.

^{3, 5}

Bone-density scans can overstate the change

DXA calculates mineral density from X-ray attenuation. Strontium in bone attenuates more strongly than calcium, so part of a rising score can reflect atomic physics rather than an equivalent increase in calcium mineral or proven fracture protection.

^{4, 2}

Frequently asked questions

Is strontium citrate the same as strontium ranelate?

No. They are different salts with different evidence and regulatory status.^{2, 3, 4}

Can strontium affect a bone-density test?

Yes. Tell the clinician interpreting DXA scans about current or past strontium use.^{2, 3, 4}

The bottom line

Strontium can change bone measurements, but supplement citrate lacks the fracture evidence and oversight of prescription ranelate—and should not borrow its claims.

References

Strontium: compound summary. PubChem, National Library of Medicine (2026) · ingredient monograph · CID 5359327
Melatonin-micronutrients Osteopenia Treatment Study (MOTS): a translational study assessing melatonin, strontium citrate, vitamin D3 and vitamin K2 (MK7) on bone density, bone marker turnover and health-related quality of life in postmenopausal osteopenic women following a one-year double-blind RCT and on osteoblast-osteoclast co-cultures. Aging (2017) · randomized trial · PMID 28130552
Recommendation to restrict the use of Protelos / Osseor (strontium ranelate). European Medicines Agency (2014) · government guidance
Toxicological Profile for Strontium. Agency for Toxic Substances and Disease Registry (2004) · government guidance · ATSDR TP-159
Dietary Supplements. U.S. Food and Drug Administration (2025) · government guidance

Revision history

2026-09-28Initial publication with claim-level citations, formulation limits, safety context, and editorial evidence review.