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Head-to-head evidence comparison — which supplement is right for you?
Calcium wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
7 of 8 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
2 of 2 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Calcium and Nicotinamide Riboside 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
300–500 mg daily
Morning with breakfast, Split dosing (morning and midday) for doses above 500 mg
Nicotinamide Riboside Chloride capsules or powder
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
1–2 weeks
4–8 weeks
8–16 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
The Effect of Nicotinamide Mononucleotide and Riboside on Skeletal Muscle Mass and Function: A Systematic Review and Meta-Analysis.
Journal of cachexia, sarcopenia and muscle (2025) · Meta analysis
Systematic review and meta-analysis evaluating NMN and NR effects on skeletal muscle mass and function
NAD+ supplementation for anti-aging and wellness: A PRISMA-guided systematic review of preclinical and clinical evidence.
Ageing research reviews (2026) · Systematic review
PRISMA-guided systematic review of both preclinical and clinical NAD+ supplementation literature
NAD+ therapy in age-related degenerative disorders: A benefit/risk analysis.
Experimental gerontology (2020) · Systematic review
Systematic review of 147 articles (113 preclinical, 34 clinical) on NAD+ precursor therapy
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.
Based on 8-week RCT showing dose-dependent increases of 22%, 51%, and 142% at 100, 300, and 1000mg respectively. Individual response varies significantly (30% show variable response). NR-SAFE trial confirmed safety up to 2000mg.
AI-estimated from published studies. Interpret as directional guidance.
Calcium has a higher evidence score (8.8/10 vs 7.2/10) and wins in 2 of 3 categories.
For healthy aging, Nicotinamide Riboside has a higher relevance score (90 vs 65).
No known interactions between Calcium and Nicotinamide Riboside have been documented in our database. However, always consult a healthcare provider before combining supplements.