Home Ingredients Strontium (Citrate / Ranelate)
Bone Health

Strontium (Citrate / Ranelate)

Evidence Level
Moderate
2 Clinical Trials
4 Documented Benefits
3/5 Evidence Score

Strontium is a mineral chemically similar to calcium that incorporates into bone matrix. STRONTIUM RANELATE is approved as PRESCRIPTION OSTEOPOROSIS DRUG in some European countries (Protelos®/Protaxos®) — but RESTRICTED IN 2014 due to cardiovascular and severe skin reaction concerns. STRONTIUM CITRATE (the supplement form) is widely sold for bone health but lacks the same direct evidence as ranelate. CRITICAL: distinct from radioactive strontium-90; supplemental strontium is non-radioactive natural strontium.

Studied Dose Strontium ranelate (prescription): 2 g/day; strontium citrate (supplement): 680 mg elemental strontium typical (in citrate form)
Active Compound Strontium (atomic number 38)

Benefits

Bone Mineral Density (Strontium Ranelate)

SOTI trial (Meunier 2004) showed strontium ranelate 2 g/day reduced vertebral fractures by 41% vs placebo over 3 years in postmenopausal osteoporosis. TROPOS trial showed reduced non-vertebral fractures. Established strontium ranelate as evidence-based osteoporosis treatment in Europe — until safety concerns led to restriction in 2014.

Supported by Trial 1, Trial 2

Dual Action — Bone Formation AND Resorption Inhibition

Distinguishes strontium from most other bone agents. Increases osteoblast (bone formation) activity AND decreases osteoclast (bone resorption) activity. Most bisphosphonates only inhibit resorption.

Supported by Trial 1, Trial 2

Strontium Citrate (Supplement) Theoretical Effects

Strontium citrate is the typical supplemental form — provides similar elemental strontium to ranelate but NOT same drug. Theoretical bone-supportive effects via similar mechanism. CRITICAL: strontium citrate lacks direct RCT evidence equivalent to ranelate; effects extrapolated from ranelate data.

Supported by Trial 1, Trial 2

DEXA Scan Artifact (False BMD Increase)

CRITICAL CONSIDERATION: strontium has higher atomic weight than calcium; even modest strontium incorporation into bone creates ARTIFACTUAL INCREASE in DEXA bone density readings (~10% per 1% strontium content). This OVERESTIMATES true bone density gains with strontium. Real bone strength gains are smaller than DEXA suggests.

Supported by Trial 1

Mechanism of action

1

Bone Matrix Incorporation

Strontium substitutes for calcium in bone hydroxyapatite — creating strontium-containing bone matrix. Mechanism similar to calcium incorporation but with different physical properties.

2

Calcium-Sensing Receptor Modulation

Strontium activates calcium-sensing receptor (CaSR) on osteoblasts and osteoclasts — basis for dual action on bone formation and resorption.

3

Osteoblast Stimulation

Increases osteoblast number, activity, and bone formation markers. Distinct from bisphosphonates which only inhibit resorption.

4

Osteoclast Inhibition

Reduces osteoclast differentiation and activity — decreasing bone resorption.

Clinical trials

1
Strontium Ranelate for Osteoporosis — SOTI Trial (Meunier 2004)
PubMed

Phase 3 RCT of strontium ranelate 2 g/day vs placebo in 1,649 postmenopausal women with osteoporosis for 3 years.

1,649 postmenopausal osteoporosis patients.

41% reduction in vertebral fracture risk vs placebo. Established strontium ranelate as evidence-based osteoporosis treatment. Foundation for European prescription approval.

2
Strontium Ranelate Cardiovascular Safety Concerns
PubMed

Pooled analyses of strontium ranelate trials examining cardiovascular events.

Pooled trial populations.

Increased risk of myocardial infarction, venous thromboembolism. Combined with severe skin reactions (DRESS syndrome cases) led to EMA RESTRICTION in 2014 — limited to severe osteoporosis where alternatives unavailable. Eventually withdrawn from many markets.

Side effects and drug interactions

Common Potential side effects

STRONTIUM RANELATE (prescription) — increased CARDIOVASCULAR EVENTS (MI, VTE), SEVERE SKIN REACTIONS (DRESS syndrome, Stevens-Johnson), restricted use in EU 2014.
Strontium citrate (supplement) — generally better tolerated; cardiovascular safety less studied at typical supplement doses.
Nausea, diarrhea (initial).
Headache.
Dermatitis.
Memory disturbance rare.
DEXA artifact creating false-high BMD readings (consideration for monitoring).

Important Drug interactions

CALCIUM SUPPLEMENTS — strontium and calcium compete for absorption; SEPARATE BY 2-3 HOURS minimum.
Tetracyclines, fluoroquinolones — strontium reduces absorption similarly to calcium; separate.
Levothyroxine — strontium reduces absorption; separate by 4 hours.
Iron, zinc, magnesium supplements — competition for absorption; separate.
Bisphosphonates (alendronate, etc.) — strontium may interfere; separate by hours.
Anticoagulants — minimal interaction.
Antibiotics that chelate divalent cations — separate.

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Frequently asked questions about Strontium (Citrate / Ranelate)

What is the recommended dosage of Strontium (Citrate / Ranelate)?

The clinically studied dose for Strontium (Citrate / Ranelate) is Strontium ranelate (prescription): 2 g/day; strontium citrate (supplement): 680 mg elemental strontium typical (in citrate form). Always follow product labeling and consult a healthcare provider for personalized dosing recommendations.

What is Strontium (Citrate / Ranelate) used for?

Strontium (Citrate / Ranelate) is studied for bone mineral density (strontium ranelate), dual action — bone formation and resorption inhibition, strontium citrate (supplement) theoretical effects. SOTI trial (Meunier 2004) showed strontium ranelate 2 g/day reduced vertebral fractures by 41% vs placebo over 3 years in postmenopausal osteoporosis. TROPOS trial showed reduced non-vertebral fractures.

Are there side effects from taking Strontium (Citrate / Ranelate)?

Reported potential side effects may include: STRONTIUM RANELATE (prescription) — increased CARDIOVASCULAR EVENTS (MI, VTE), SEVERE SKIN REACTIONS (DRESS syndrome, Stevens-Johnson), restricted use in EU 2014. Strontium citrate (supplement) — generally better tolerated; cardiovascular safety less studied at typical supplement doses. Always consult a healthcare provider before starting any new supplement, especially if you have underlying conditions or take medications.

Does Strontium (Citrate / Ranelate) interact with medications?

Known drug interactions may include: CALCIUM SUPPLEMENTS — strontium and calcium compete for absorption; SEPARATE BY 2-3 HOURS minimum. Tetracyclines, fluoroquinolones — strontium reduces absorption similarly to calcium; separate. Consult a pharmacist or healthcare provider if you take prescription medications.

Is Strontium (Citrate / Ranelate) good for bone health?

Yes, Strontium (Citrate / Ranelate) is researched for Bone Health support. SOTI trial (Meunier 2004) showed strontium ranelate 2 g/day reduced vertebral fractures by 41% vs placebo over 3 years in postmenopausal osteoporosis. TROPOS trial showed reduced non-vertebral fractures.