Strontium: Benefits, Dosage, Forms & Research

What the Research Says

Strontium has the strongest evidence of any trace mineral for bone health, but primarily for the prescription ranelate form. The SOTI trial (Meunier et al., 2004, n=1,649) and TROPOS trial (Reginster et al., 2005, n=5,091) demonstrated significant vertebral and non-vertebral fracture reduction with strontium ranelate in postmenopausal osteoporosis. However, post-marketing surveillance revealed increased cardiovascular events, leading the EMA to restrict its use to severe osteoporosis in patients without cardiovascular risk factors. OTC strontium citrate has not been studied in large RCTs, but shares the same active element. An important caveat: strontium artificially inflates DEXA scan readings by approximately 10% due to its higher atomic number, meaning some of the apparent BMD increase is measurement artifact.

Benefits of Strontium

• Fracture reduction — the SOTI trial (Meunier et al., 2004, n=1,649) found strontium ranelate 2g/day reduced vertebral fractures by 41% over 3 years in postmenopausal women with osteoporosis
• Bone density increase — the TROPOS trial (Reginster et al., 2005, n=5,091) showed strontium ranelate reduced non-vertebral fractures by 16% and hip fractures by 36% in high-risk elderly women over 3 years
• Dual mechanism — strontium uniquely both stimulates osteoblast-mediated bone formation and inhibits osteoclast-mediated bone resorption, unlike most osteoporosis drugs which only reduce resorption
• Bone quality — strontium incorporates into hydroxyapatite crystals in bone, potentially improving bone mechanical strength
• OTC availability — strontium citrate provides the same elemental strontium as prescription forms without requiring a prescription

Side Effects and Safety

Safety profile: Safe with Caution

Potential Side Effects

• Nausea and diarrhea (most common)
• Headache
• Artificially elevates DEXA bone density readings — strontium is heavier than calcium and inflates measurements by an estimated 10%
• Strontium ranelate (prescription) was associated with increased cardiovascular events (VTE, MI) in post-marketing surveillance — led to restrictions in Europe
• Theoretical cardiovascular concerns may apply to citrate form, though data is lacking

Drug & Supplement Interactions

• Calcium — competes directly with strontium for absorption; never take together; separate by 2+ hours
• Tetracycline and quinolone antibiotics — strontium may reduce their absorption
• Food (especially dairy) reduces strontium absorption — take on empty stomach
• Aluminum and magnesium antacids may reduce strontium absorption