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Head-to-head evidence comparison — which supplement is right for you?
Calcium vs Quercetin: Calcium has the stronger overall evidence (8 vs 6/10); 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
Likely helps
13 of 15 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
8 of 9 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Calcium and Quercetin 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
500-1000mg
With meals containing fat, Split into 2 doses
Quercetin phytosome (improved absorption)
and 7 more not shown
and 1 more not shown
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
2-4 weeks
2-4 weeks
4-8 weeks
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
Quercetin as a therapeutic agent for skin problems: a systematic review and meta-analysis on antioxidant effects, oxidative stress, inflammation, wound healing, hyperpigmentation, aging, and skin cancer
Naunyn-Schmiedeberg's archives of pharmacology (2025) · Meta analysis · n=1398
Furthermore, quercetin significantly inhibited tyrosinase activity (Z-score, 1.95), resulting in a significantly reduced melanin content (Z-score, 2.56).
Efficacy and safety of dietary polyphenol supplements for COPD: a systematic review and meta-analysis
Frontiers in immunology (2025) · Meta analysis · n=894
This systematic review confirms that the efficacy of dietary polyphenols is significantly composition-specific.
Safety and efficacy of antioxidant therapy in children and adolescents with attention deficit hyperactivity disorder: A systematic review and network meta-analysis
PloS one (2024) · Meta analysis · n=3650
The rankings of safety and efficacy of the 12 antioxidants vary.
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.
Meta-analysis of 896 subjects showed modest reductions in systolic (-3.09 mmHg) and diastolic (-2.86 mmHg) BP. Effect size is small and bioavailability varies significantly by form.
AI-estimated from published studies. Interpret as directional guidance.
Calcium has a higher evidence score (8/10 vs 6/10) and wins in 2 of 3 categories.
For bone health, Calcium has a higher relevance score (95 vs 70).
No known interactions between Calcium and Quercetin have been documented in our database. However, always consult a healthcare provider before combining supplements.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.