Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Calcium alpha-ketoglutarate

SpecialtyKeto acid saltBest with a meal

Useful mainly for experimentally minded users; no proven clinical benefit in humans.

Quick decision guide

May help most

Experimentally minded users; no proven clinical benefit in humans

Common dosing range

1,000 mg/day typical; up to ~3,000 mg studied

When to expect effects

Unknown

Watch out for

Human longevity/healthspan claims are unproven; data are mostly animal

What is it

Calcium alpha-ketoglutarate (Ca-AKG) is the calcium salt of alpha-ketoglutarate, a Krebs-cycle metabolite involved in energy production and amino-acid metabolism. It is marketed as a longevity and “healthy aging” supplement, largely on the strength of animal lifespan studies.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You accept it is experimental and want a low-risk Krebs-cycle metabolite
You are tracking aging biomarkers out of personal interest

Probably skip if…

You want a supplement with proven human healthspan benefit
You expect measurable anti-aging effects
You need to limit calcium intake

Evidence at a glance

healthy aging / longevity

Limited Evidence
Effect
Not established in humans
Best fit
None clinically established
Time
Unknown

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

healthy aging / longevity

Mechanism only
Limited Evidence

Alpha-ketoglutarate extended lifespan and compressed late-life morbidity in mice and other model organisms, and a small open-label human study reported a reduction in a DNA-methylation “biological age” estimate. There are no controlled human trials demonstrating effects on disease, function, or survival, so the longevity claim remains preclinical and biomarker-level.

Effect size
Not established in humans
Time to effect
Unknown
Best fit
None clinically established
Less likely
Anyone expecting a proven lifespan or healthspan effect

Bottom line: Animal and early biomarker data are intriguing, but no human outcome trial supports an anti-aging effect.

SourceNaeini et al., 2023 — PubMedAsadi et al., 2020 — PMC

How it works

Alpha-ketoglutarate (AKG) participates in multiple critical cellular processes. As a Krebs cycle intermediate, it is central to energy production and amino acid metabolism. It also serves as a substrate for several dioxygenase enzymes that regulate gene expression, including ten-eleven translocation (TET) enzymes (involved in DNA demethylation), Jumonji-domain histone demethylases, and prolyl hydroxylases (regulating hypoxia-inducible factor stability). Research suggests AKG declines with age in many tissues, and supplementation may compensate for this decline by supporting these epigenetic regulators and metabolic processes. In animal studies, AKG supplementation has been shown to extend healthspan and median lifespan, reduce inflammation, support bone density, and improve various age-related parameters. The calcium component of calcium alpha-ketoglutarate provides additional calcium, which itself supports bone health. The combination is marketed specifically for healthy aging applications. Human clinical evidence remains very limited, with one small open-label trial reporting reductions in epigenetic aging markers, but rigorous controlled trials are lacking.

How to take it

1. Typical dose
1,000 mg/day is a common dose
2. Higher studied dose
Up to about 3,000 mg/day has been used
3. Timing
Any time of day
4. With food
Either; no clear food requirement
5. How long to try
No validated trial period for a human outcome

What to track

Calcium intake from all sources
GI tolerability

3 commercial forms

Compare the main delivery options and what they’re best suited for.

Calcium alpha-ketoglutarate

The form used in the published human longevity study. Contains both calcium and AKG.

Provides calcium plus AKG; absorption similar to other calcium salts.

Sodium alpha-ketoglutarate

Used in some research and supplements; provides AKG without additional calcium.

Sodium salt; alternative for those avoiding extra calcium.

Arginine alpha-ketoglutarate (AAKG)

Different application focus; provides arginine plus AKG. Limited evidence for athletic performance benefits.

Combined with arginine; marketed for athletic performance.

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

Generally well toleratedOccasional mild GI upset

Who should avoid it

  • People with hypercalcemia or who must restrict calcium

Pregnancy & breastfeeding

No safety data; avoid unless advised by a clinician.

Interactions

calcium-sensitive conditions or supplementsMinor

Adds to total daily calcium load, relevant if other calcium sources are high

Food sources

Most foods

Amount
AKG is endogenously produced in cellular metabolism; not typically discussed as a dietary intake target
%DV
—

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

States elemental calcium per dose
Third-party tested for identity and purity

Be skeptical of…

“Reverses aging”
“Clinically proven to extend lifespan”
Specific “years younger” biological-age claims

Frequently asked questions

Does calcium alpha-ketoglutarate slow aging?⌄

Animal studies show effects on aging and lifespan with AKG supplementation. One small human study showed reductions in epigenetic age markers, but rigorous human trials are lacking. Claims should be approached cautiously.

How much calcium does it contain?⌄

Calcium alpha-ketoglutarate is roughly 15-18% calcium by weight. A 1 gram dose provides approximately 150-180 mg calcium. Factor this into your total daily calcium intake.

Is it the same as the AKG used in bodybuilding?⌄

Arginine alpha-ketoglutarate (AAKG) is a different combination used in pre-workout supplements for performance. Calcium AKG is used primarily for longevity and bone health applications.

Should I take it with or without food?⌄

With food. This improves calcium absorption and reduces gastrointestinal upset. Spread the dose between meals if taking more than 1 gram daily.

Are there any side effects?⌄

Calcium AKG appears well tolerated in limited human use. The calcium component may contribute to constipation. Long-term safety beyond the small human study is not well characterized.

References by claim

healthy aging / longevity

Naeini et al., 2023 — PubMed (2023) link

Asadi et al., 2020 — PMC (2020) link

Track Calcium alpha-ketoglutarate with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

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Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.