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Head-to-head evidence comparison — which supplement is right for you?
Calcium vs Manganese: Calcium has the stronger overall evidence (5.5 vs 4/10); they're alternatives for bone health — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Calcium wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Too few graded studies
Top outcomes
1000–1200mg daily (split doses) (no cited trial states the dose it used)
Split doses with meals, 500mg with breakfast, 500mg with dinner
Calcium Citrate
2-5 mg daily. The cited two-year trial gave 5 mg a day together with calcium, zinc and copper, so its result cannot be credited to manganese alone.
With food, Can take with other minerals
Manganese Bisglycinate or Citrate
and 7 more not shown
High-dose calcium supplementation reduces manganese bioavailability. Since manganese is required for bone matrix proteoglycan synthesis, severe depletion could theoretically offset some bone benefits of calcium supplementation.
Separate calcium and manganese supplementation by at least 1–2 hours. Ensure adequate manganese intake (2–5 mg/day) when on chronic high-dose calcium therapy.
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
12-24 weeks
4-8 weeks
With chronic excess
Use of calcium or calcium in combination with vitamin D supplementation to prevent fractures and bone loss in people aged 50 years and older: a meta-analysis
Lancet (2007) · Meta analysis · n=63897
29 randomised trials, 63,897 participants aged 50 or older, pooled with a random-effects model.
Role of calcium and/or vitamin D supplementation in preventing osteoporotic fracture in the elderly: a systematic review and meta-analysis
Indian J Med Res (2023) · Meta analysis
18 RCTs in adults over 60, comparing calcium, vitamin D or both against no treatment or placebo.
Calcium and vitamin D for increasing bone mineral density in premenopausal women
Cochrane Database Syst Rev (2023) · Systematic review · n=941
7 RCTs, 941 healthy premenopausal women: 138 randomised to calcium, 110 to vitamin D, 271 to both, 422 to placebo. Mean ages 18.1 to 42.1.
Association of Blood Manganese and Preeclampsia: A Systematic Review and Meta-analysis
Biological trace element research (2024) · Meta analysis · n=1113
Pooled results showed that compared to normotensive control, women with PE had significantly lower blood Mn concentration (standardized mean difference: -0.36, 95% confidence interval: -0.50 to -0.22, p < 0.001; I2 = 67%).
Manganese Exposure and Metabolic Syndrome: A Systematic Review and Meta-Analysis
Nutrients (2022) · Meta analysis
Therefore, the present review examined the association between dietary and environmental Mn exposure, and MetS risk.
Manganese exposure and cognitive performance: A meta-analytical approach
Environmental pollution (Barking, Essex : 1987) (2023) · Meta analysis · n=18
Differences between the exposure and control groups in cognitive testing were synthesized by effect size Hedge's g.
Calcium has a higher evidence score (5.5/10 vs 4/10) and wins in 2 of 3 categories.
For bone health, Calcium has a higher relevance score (95 vs 35).
High-dose calcium supplementation reduces manganese bioavailability. Since manganese is required for bone matrix proteoglycan synthesis, severe depletion could theoretically offset some bone benefits of calcium supplementation. Separate calcium and manganese supplementation by at least 1–2 hours. Ensure adequate manganese intake (2–5 mg/day) when on chronic high-dose calcium therapy. Consult a healthcare provider for personalized advice.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.