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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
18 of 20 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
4 of 5 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Calcium and Calcium AKG 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
1000-2000mg
Morning, With or without food
Calcium alpha-ketoglutarate powder or capsules
Combined use increases total daily calcium load. At total doses exceeding 2500 mg/day, the risk of constipation, kidney stone formation, and potential cardiovascular calcification increases. However, moderate combined dosing may enhance bone mineralization without adverse effects.
Account for elemental calcium from calcium AKG when calculating total daily calcium intake. Keep total elemental calcium below 2000–2500 mg/day. No need to separate timing unless total intake is high; the AKG component is beneficial when taken around meals.
6-24 months
12-36 months
Throughout pregnancy
Within days of starting
4-6 months
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 metabolite α-ketoglutarate extends lifespan by inhibiting ATP synthase and TOR
Nature (2014) · Preclinical
α-ketoglutarate extends the lifespan of adult Caenorhabditis elegans
Recruitment evaluation of a gerotherapeutic randomized controlled trial testing alpha-ketoglutarate in biologically older, middle-aged adults (ABLE)
Experimental gerontology (2025) · Rct · n=120
Eligibility rates were 80.3 % at pre-screening and 67.3 % at screening, with a consent rate of 66.1 %.
Effects of Multi-Ingredient Pre-Workout Supplement and Caffeine on Bench Press Performance: A Single-Blind Cross-Over Study
Nutrients (2022) · Crossover · n=15
In a cross-over manner, they participated in two sessions where they were blinded to the order of supplementation they were given: either a MIPS including caffeine or caffeine alone.
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 single RCT (n=40) showing prevention of performance decline in track athletes. Effect was prevention of countermovement jump height decrease rather than enhancement. Limited evidence from one small study.
AI-estimated from published studies. Interpret as directional guidance.
Calcium has a higher evidence score (8/10 vs 3.5/10) and wins in 2 of 3 categories.
For healthy aging, Calcium has a higher relevance score (65 vs 32).
Combined use increases total daily calcium load. At total doses exceeding 2500 mg/day, the risk of constipation, kidney stone formation, and potential cardiovascular calcification increases. However, moderate combined dosing may enhance bone mineralization without adverse effects. Account for elemental calcium from calcium AKG when calculating total daily calcium intake. Keep total elemental calcium below 2000–2500 mg/day. No need to separate timing unless total intake is high; the AKG component is beneficial when taken around meals. Consult a healthcare provider for personalized advice.