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Head-to-head evidence comparison — which supplement is right for you?
Calcium AKG vs Hydroxyapatite (MCHC): Calcium AKG has the stronger overall evidence (3.5 vs 4.5/10); they work on different things and are often used together, not either/or. Take the 60-second quiz for a pick tailored to your goals.
Calcium AKG 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
1000-2000mg (a typical label dose, the cited trials gave 6 g of AKG a day as its calcium salt, or 1 g of calcium AKG without stating how often)
Morning, With or without food
Calcium alpha-ketoglutarate powder or capsules
3,320 mg of the compound daily, as two 830 mg tablets twice a day (about 712 mg elemental calcium), the regimen of the 3-year osteoporosis trial and the 851-woman cohort. A 6-month pain trial used 1,660 mg a day.
Split doses with meals, Morning and evening
Ossein-hydroxyapatite compound tablets
and 7 more not shown
Total calcium can pass the 2,000-2,500 mg/day upper level once diet is counted, with a higher risk of constipation and kidney stones.
Count the elemental calcium in both products toward one daily total and stay within the upper level.
4-6 months
4-8 weeks
12-36 months
N/A
Hours to 3 months
5-6 months
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.
Efficacy of ossein-hydroxyapatite complex compared with calcium carbonate to prevent bone loss: a meta-analysis.
Menopause (2009) · Meta analysis
Meta-analysis of randomised controlled trials comparing ossein-hydroxyapatite complex (OHC) with calcium carbonate, not with placebo. Of 18 controlled trials identified, 6 were pooled in a random-effects model, and the abstract does not give the total number of participants.
Comparison of the treatment effects of ossein-hydroxyapatite compound and calcium carbonate in osteoporotic females.
Osteoporos Int (1995) · Rct · n=40
Randomised, double-masked trial in 40 women with postmenopausal osteoporosis, each given 1,400 mg calcium a day as either OHC or calcium carbonate for 20 months.
Comparison of the effects of ossein-hydroxyapatite complex and calcium carbonate on bone metabolism in women with senile osteoporosis: a randomized, open-label, parallel-group, controlled, prospective study.
Clin Drug Investig (2011) · Rct · n=120
Randomised, open-label trial in 120 women over 65 with osteoporosis (55 OHC, 65 calcium carbonate), of whom 54 completed 3 years. OHC gave 712 mg elemental calcium a day and calcium carbonate 1,000 mg, and both groups also took calcifediol.
Calcium AKG has a higher evidence score (3.5/10 vs 4.5/10) and wins in 2 of 3 categories.
Total calcium can pass the 2,000-2,500 mg/day upper level once diet is counted, with a higher risk of constipation and kidney stones. Count the elemental calcium in both products toward one daily total and stay within the upper level. 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.