Calcium Alpha-Ketoglutarate — Safety, Research, Risks & Legal Status

Not medical advice. Calcium Alpha-Ketoglutarate is discussed here for informational and harm-reduction purposes only. We do not endorse use, and any dosing context is informational, not a protocol.

Also known as	Ca-AKG, calcium salt of alpha-ketoglutarate, TCA cycle intermediate
Category	Supplement
tca_cycle_intermediate	True
epigenetic_modifier	True
human_trial_data	minimal and unpublished
bioavailability_challenge	poor oral absorption
US legal status	Sold as dietary supplement in the USA (DSHEA). Not FDA-approved as drug. Available over-the-counter. Limited regulatory oversight; quality varies by manufacturer.

What is Calcium Alpha-Ketoglutarate?

A calcium salt form of alpha-ketoglutarate, a TCA cycle intermediate. Proposed to support cellular energy production and mitochondrial function. Intracellular AKG is involved in the NAD+/NADH ratio and histone acetylation (epigenetic aging markers).

How it works

AKG is a TCA cycle intermediate and cofactor for alpha-ketoglutarate-dependent dioxygenases (TET enzymes, prolyl hydroxylases). Involved in epigenetic modification (histone/DNA methylation) and histone deacetylase regulation. Proposed to reverse aging via epigenetic reprogramming.

Background & history

AKG and aging studied since 2016 (Buck Institute). Used as supplement precursor; limited commercialization. Very few human trials. Mostly preclinical evidence in C. elegans and cell culture.

What the research says

Preclinical studies (cell culture, rodent models) suggest AKG improves mitochondrial respiration and extends lifespan in C. elegans (a model organism). Very limited human data; one small unpublished trial suggested improved muscle mass. Evidence is preliminary; human efficacy not established.

Reported effects

Preclinical evidence for improved mitochondrial function and ATP production
C. elegans studies suggest lifespan extension; translation to humans unclear
Small unpublished human data suggest potential muscle-mass benefits
Studied for anti-inflammatory and epigenetic aging effects
Proposed support for histone deacetylases (sirtuins) and AMPK
Possible role in collagen synthesis and tissue repair

Dosing & administration (informational)

Animal studies use high doses (1000-2000 mg/kg). Human supplement doses range 1000-3000 mg daily. No optimal dose established; bioavailability is poor and highly variable.

This is general research/context information, not medical advice or a recommended protocol.

Safety & side effects

Generally recognized as safe at dietary supplement doses
GI side effects possible: diarrhea, nausea at high doses
Long-term human safety not studied; evidence is limited to short-term studies and preclinical
Interaction with medications unknown
Quality and purity of commercial products not standardized
Calcium load may affect patients with kidney disease or hypercalcemia

Drug & supplement interactions

Other TCA-cycle intermediates (citrate, succinate): mechanism overlap
Epigenetic modulators (resveratrol, NMN): potential additive effects unclear
Thiamine (vitamin B1): required cofactor for AKG metabolism
Iron and vitamin C: cofactors for AKG-dependent dioxygenases
Medications affecting kidney function: AKG metabolism altered

Who should avoid it

Hypercalcemia or kidney disease (calcium load concern)
Severe liver impairment (TCA-cycle dysfunction)
Active hyperparathyroidism
Pregnancy or lactation (insufficient safety data)
Concurrent high-dose calcium supplements (duplication)

How it is commonly combined

Ca-AKG may stack with other NAD+-dependent pathways (NMN, NR) or epigenetic modulators (resveratrol) but combinations are untested in humans; avoid stacking with other AKG sources or high-dose calcium.

Legal & regulatory. Sold as dietary supplement in the USA (DSHEA). Not FDA-approved as drug. Available over-the-counter. Limited regulatory oversight; quality varies by manufacturer.

Quality & harm reduction

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Lab testing & harm-reduction tools

If you are going to research a compound, verifying identity and purity is the single most protective step. Independent analytical testing and sterile-handling supplies reduce risk.

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Frequently asked questions

Does Ca-AKG actually improve mitochondrial function in humans?

Preclinical studies suggest mitochondrial benefits. No human clinical trials published; efficacy in humans is unproven.

Is Ca-AKG the same as sodium AKG?

Both are salts of alpha-ketoglutarate with similar proposed mechanisms. Calcium form is more common in supplements; sodium form used in research. Relative efficacy unknown.

Can I get AKG from food?

AKG is produced endogenously from amino-acid metabolism; dietary sources are minimal. Exogenous supplementation aims to increase intracellular AKG.

What about the calcium content in Ca-AKG?

One gram of Ca-AKG provides ~130 mg elemental calcium. High-dose use may contribute to total daily calcium; avoid if already supplementing or using high-dose calcium.

References & further reading

Buck Institute AKG and aging research publications
C. elegans lifespan extension studies with AKG
TCA cycle biochemistry and dioxygenase pathways
Limited human supplement quality assessments