Mineral ·Moderate evidence ·Reviewed May 2026
Trace element that supports bone density by stimulating osteoblasts and inhibiting osteoclasts.
The bottom line
Evidence rating moderate. Most-documented uses: bone density, osteoporosis support. 17 sources indexed (2003–2024), with 10 interaction records on file.
Core mechanism
Activates calcium-sensing receptor (CaSR) on osteoblasts, stimulating bone formation. Also inhibits osteoclast differentiation via OPG/RANKL pathway. Dual mechanism unique among bone supplements.5
Take at bedtime, SEPARATE from calcium by 4+ hours (competes for absorption)17
Dosing protocol
Take separately from calcium to avoid mutual interference. Hold 2 weeks before any DXA scan.17
Ranked by evidence and value.
Real-world pricing across three quality tiers. Assumes Strontium Citrate.
Weak estimate: assumes 680 mg strontium citrate/day and excludes prescription strontium ranelate. Vendor basis: iHerb, Vitacost, Amazon marketplace, and specialty mineral brands. Updated 2026-05-28.
How much you'd eat to match a supplemental dose.
A practical food equivalent for supplement-dose strontium does not exist.
What to test, the optimal window inside the conventional range, and how long a response takes.
Strontium citrate or carbonate supplementation raises serum and bone strontium. Strontium ranelate (prescription, not US) increased bone density in osteoporosis RCTs.16,1
Strontium interferes with DXA scans by absorbing more X-rays than calcium, falsely inflating apparent bone density. Hold strontium for at least 2 weeks before DXA, or use a correction factor.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Strontium citrate or carbonate increased bone density in osteoporosis RCTs (most evidence from prescription strontium ranelate, not US).16,1
Interferes with DXA accuracy; hold 2 weeks before scan.
Evidence-based stacks that include it, with the exact dose and timing each one uses.
Strontium is chemically similar to calcium and is incorporated into bone. The fracture-reduction evidence comes from the prescription drug strontium ranelate, not the strontium citrate sold as a supplement, and ranelate was later restricted in Europe over cardiovascular and venous thromboembolism risk. Because the citrate form lacks comparable outcome data, competes with calcium for absorption, and distorts bone density scans, it should be used cautiously and only under clinician guidance.5,1
Strontium and calcium compete for the same intestinal absorption pathway, and calcium is preferentially absorbed, so taking them together substantially reduces strontium uptake.
Recommendation: Separate strontium and calcium doses by at least 2 to 3 hours. Many people take strontium at bedtime and calcium with meals to avoid competition.
Adequate vitamin D3 supports the calcium handling and bone mineralization environment in which strontium exerts its bone-building and antiresorptive effects.
Recommendation: Maintain sufficient vitamin D3 status when using strontium for bone health. Vitamin D3 and strontium do not compete and can be taken on the same regimen.
Vitamin K2 supports directing calcium into bone and away from arteries, complementing strontium's bone-building action within a bone-health regimen.
Recommendation: Reasonable to include vitamin K2 alongside strontium for bone support, especially when calcium and vitamin D are also used. They do not compete for absorption.
Taking strontium and an oral iron supplement at the same time can lower how much of each you actually absorb. This mirrors the well-documented requirement to separate strontium from calcium: regulatory product information for strontium ranelate explicitly groups oral iron with calcium and food as agents that should be dosed several hours apart from strontium because they impair its uptake. The interaction is purely about co-administration timing, not a systemic or toxic effect, and it is fully avoidable by spacing the doses.
Recommendation: Separate strontium and oral iron by at least 2 hours (3 to 4 hours is ideal). A practical pattern: take iron with vitamin C earlier in the day on a relatively empty stomach, and take strontium at bedtime, at least 2 hours after the last food or mineral dose. Do not combine them in the same glass or the same with-meal slot.
Strontium and magnesium taken in the same dose can compete for absorption because both move across the gut as divalent cations using overlapping pathways. Strontium uptake is already sensitive to other minerals in the gut (this is why strontium must be separated from calcium), and magnesium falls into the same competitive category. The practical consequence is reduced strontium bioavailability when a meaningful magnesium dose is co-ingested. This is a timing issue, not a safety hazard.
Recommendation: Separate strontium and magnesium by at least 2 hours. A clean stack: magnesium with dinner or earlier in the evening, then strontium at bedtime at least 2 hours later on an empty stomach. Avoid putting both in the same nighttime pill pile. Lower magnesium doses (under about 100 mg elemental) are less likely to matter, but spacing is the safe default.
Strontium is a divalent cation that can chelate bisphosphonates in the gut, blocking absorption. Strontium and bisphosphonates also compete for incorporation into bone and have overlapping mechanisms, so combined use is generally avoided or strictly sequenced.
Recommendation: Do not take strontium and alendronate at the same time. If both are used (rare in current practice), separate doses by at least 2 hours, and discuss with your prescriber whether the combination is truly indicated.
Prednisone can cause clinically important bone loss when used chronically. Strontium supplements may make DXA bone density results look higher because strontium in bone attenuates X-rays more than calcium, which can obscure whether steroid-induced bone loss is actually controlled.
Recommendation: Do not use strontium as a substitute for guideline-based prednisone bone protection. Tell your clinician and imaging center if you use strontium, especially before DXA testing, so bone density trends are interpreted cautiously.
Prednisolone can accelerate bone loss during prolonged therapy. Strontium supplements can artifactually elevate DXA bone density readings, which may mask ongoing steroid-related bone loss or make treatment response look better than it is.
Recommendation: Tell your clinician if you take strontium while on chronic prednisolone, particularly before bone density testing. Use strontium cautiously and do not let it replace calcium, vitamin D, fracture-risk assessment, or prescription osteoporosis therapy when indicated.
Methylprednisolone can cause bone loss when used repeatedly or chronically. Strontium supplements can raise apparent DXA bone density independent of true bone strength, complicating monitoring for glucocorticoid-induced osteoporosis.
Recommendation: If you use strontium while taking methylprednisolone, make sure it is recorded before DXA testing and osteoporosis decisions. Do not use strontium to self-treat steroid-induced bone loss without clinician guidance.
Dexamethasone is a potent glucocorticoid and can contribute to bone loss when exposure is repeated or prolonged. Strontium supplements can artifactually increase DXA-measured bone density, making steroid-related bone monitoring less reliable.
Recommendation: Tell your clinician about strontium use before bone density testing while on dexamethasone. Use evidence-based bone protection and fracture-risk assessment rather than relying on strontium-related DXA changes.
Numbered references. Citations throughout the page link here.
Over 8 years of treatment, cumulative fracture incidences during years 6-8 were not different from the first 3 years, demonstrating sustained benefit.
Strontium ranelate reduced vertebral fracture risk in osteopenic women from the SOTI and TROPOS trials over 3 years of treatment.
Strontium ranelate reduced risk of all nonvertebral fractures by 16% and major fragility fractures by 19% in postmenopausal osteoporotic women.
Ghani A, Arfee S. Role of Calcitonin and Strontium Ranelate in Osteoporosis. Indian journal of orthopaedics. 2023
Curtis EM, Cooper C, Harvey NC. Cardiovascular safety of calcium, magnesium and strontium: what does the evidence say?. Aging clinical and experimental research. 2021
RCT data indicate higher incidence of non-adjudicated MI with strontium ranelate vs placebo (1.7 vs 1.1%); now contraindicated in patients with cardiovascular history.
Stepan JJ. Strontium ranelate: in search for the mechanism of action. Journal of bone and mineral metabolism. 2013
Deeks ED, Dhillon S. Strontium ranelate: a review of its use in the treatment of postmenopausal osteoporosis. Drugs. 2010
Neuprez A, Hiligsmann M, Scholtissen S et al.. Strontium ranelate: the first agent of a new therapeutic class in osteoporosis. Advances in therapy. 2008
Blake GM, Lewiecki EM, Kendler DL et al.. A review of strontium ranelate and its effect on DXA scans. Journal of clinical densitometry : the official journal of the International Society for Clinical Densitometry. 2007
Blake GM, Fogelman I. Strontium ranelate: a novel treatment for postmenopausal osteoporosis: a review of safety and efficacy. Clinical interventions in aging. 2006
Burlet N, Reginster JY. Strontium ranelate: the first dual acting treatment for postmenopausal osteoporosis. Clinical orthopaedics and related research. 2006
Strontium ranelate is the first antiosteoporotic treatment with dual mode of action, simultaneously increasing bone formation while decreasing bone resorption.
Case reports describe DRESS syndrome during strontium ranelate treatment.
Strontium administration increased bone tissue mineral density across all forms; strontium citrate exhibited the weakest effect compared to ranelate and chloride.
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