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SupplementScience

Types of Strontium: Forms & Bioavailability

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Forms Comparison

FormBioavailabilityBest ForElemental Content
Strontium CitrateModerateOTC bone support — most commonly available supplement form33% elemental strontium by weight
Strontium Ranelate (Protelos)ModeratePrescription-only (Europe) — best-studied form with large RCT evidence for fracture reduction34% elemental strontium by weight
Strontium ChlorideModerateUsed in some supplements and toothpaste for tooth sensitivity

Strontium Citrate

Bioavailability: Moderate. Best for: OTC bone support — most commonly available supplement form. Elemental content: 33% elemental strontium by weight.

Strontium Ranelate (Protelos)

Bioavailability: Moderate. Best for: Prescription-only (Europe) — best-studied form with large RCT evidence for fracture reduction. Elemental content: 34% elemental strontium by weight.

Strontium Chloride

Bioavailability: Moderate. Best for: Used in some supplements and toothpaste for tooth sensitivity.

Full Strontium Guide

References

  1. (). The effects of strontium ranelate on the risk of vertebral fracture in women with postmenopausal osteoporosis. New England Journal of Medicine. DOI
  2. (). Strontium ranelate reduces the risk of nonvertebral fractures in postmenopausal women with osteoporosis: Treatment of Peripheral Osteoporosis (TROPOS) study. Journal of Clinical Endocrinology & Metabolism. DOI
  3. (). Maintenance of antifracture efficacy over 10 years with strontium ranelate in postmenopausal osteoporosis. Osteoporosis International. DOI