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Head-to-head evidence comparison — which supplement is right for you?
Calcium and Potassium are closely matched across evidence, studies, and safety.
Verdict
Likely helps
18 of 20 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
10 of 15 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Calcium and Potassium have evidence — compare verdict strength side-by-side.
1000–1200mg daily (split doses)
Split doses with meals, 500mg with breakfast, 500mg with dinner
Calcium Citrate
99-500mg daily from supplements (food provides more)
With food to reduce GI upset, Spread throughout day, During/after exercise for athletes
Potassium Citrate or Potassium Gluconate
Combined potassium (as citrate/bicarbonate) and calcium supplementation improves net calcium balance by reducing renal calcium wasting. This combination is particularly beneficial for bone health in individuals with high protein diets (which increase acid load and calcium loss). Also synergistically supports blood pressure reduction.
Potassium citrate (1500–3000 mg/day) combined with calcium supplementation enhances calcium retention and bone mineral density. Particularly recommended for individuals with high-protein diets, recurrent kidney stones, or hypertension.
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
2-4 weeks
1-2 weeks
Long-term
With excess or kidney issues
Effects of combined calcium and vitamin D supplementation on osteoporosis in postmenopausal women: a systematic review and meta-analysis of randomized controlled trials.
Food & Function (2020) · Meta analysis · n=12000
Combined calcium and vitamin D significantly improved lumbar spine BMD in postmenopausal women
Association Between Calcium or Vitamin D Supplementation and Fracture Incidence in Community-Dwelling Older Adults: A Systematic Review and Meta-analysis.
JAMA (2017) · Meta analysis · n=51145
33 trials involving 51,145 participants were analyzed
Vitamin D and Calcium for the Prevention of Fracture: A Systematic Review and Meta-analysis.
JAMA Network Open (2019) · Meta analysis · n=51419
Meta-analysis of 11 randomized clinical trials with 51,419 participants
Effect of changes in potassium intake on blood pressure: a dose–response meta-analysis of randomized clinical trials (2000–2024)
Clinical Kidney Journal (2025) · Meta analysis · n=2500
Dose-response analysis of RCTs from 2000-2024
Magnesium and Potassium Supplementation for Systolic Blood Pressure Reduction in the General Normotensive Population: A Systematic Review and Subgroup Meta-Analysis for Optimal Dosage and Treatment Length
Nutrients (2024) · Meta analysis
Both supplements demonstrated greater reductions in SBP for the general population at lower dosages and longer treatment durations.
Sex-specific associations between sodium and potassium intake and overall and cause-specific mortality: a large prospective U.S. cohort study, systematic review, and updated meta-analysis of cohort studies
BMC medicine (2024) · Meta analysis · n=237036
Meta-analysis examining Potassium efficacy
Based on meta-analysis of 59 RCTs showing 0.6-1.8% BMD increases. Requires vitamin D co-supplementation for optimal effect. Effectiveness plateaus beyond 1200mg daily.
AI-estimated from published studies. Interpret as directional guidance.
Both Calcium and Potassium are closely matched — the best choice depends on your specific health goals.
For reduce inflammation, Potassium has a higher relevance score (85 vs 35).
Calcium and Potassium may work well together: Combined potassium (as citrate/bicarbonate) and calcium supplementation improves net calcium balance by reducing renal calcium wasting. This combination is particularly beneficial for bone health in individuals with high protein diets (which increase acid load and calcium loss). Also synergistically supports blood pressure reduction. Potassium citrate (1500–3000 mg/day) combined with calcium supplementation enhances calcium retention and bone mineral density. Particularly recommended for individuals with high-protein diets, recurrent kidney stones, or hypertension.