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

Alpha-Ketoglutarate

SpecialtyKeto acidBest with a meal

Useful mainly for healthy-aging enthusiasts willing to act on early, unproven longevity signals.

Quick decision guide

May help most

Healthy-aging enthusiasts willing to act on early, unproven longevity signals

Common dosing range

1–3 g/day (1 g/day calcium-AKG in the main human aging study)

When to expect effects

Months for any aging marker; weeks for recovery applications

Watch out for

Human evidence is minimal; salt form adds calcium or sodium load

What is it

Alpha-ketoglutarate (AKG) is an essential intermediate in the Krebs (citric acid) cycle and a key substrate for amino acid metabolism. It is produced endogenously in all cells and is available as a supplement (often as calcium, sodium, or arginine salts) marketed for healthy aging, athletic performance, and various other applications.

Is it worth it for you?

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

Worth considering if…

You are an early adopter comfortable acting on preclinical longevity data
You account for the salt form's calcium or sodium load

Probably skip if…

You want proven effects on aging, lifespan, or muscle
You have cancer, kidney disease, or hypercalcemia (calcium-AKG)
You are pregnant or breastfeeding

Evidence at a glance

healthy aging biomarkers

Mixed Evidence
Effect
Preliminary; reported reduction in DNA-methylation age in one small trial
Best fit
Early adopters tracking biological-age markers
Time
Months

lifespan and healthspan extension

Mixed Evidence
Effect
Unproven in humans
Best fit
Not established
Time
Not established

muscle protein synthesis and recovery

Mixed Evidence
Effect
Unproven in humans
Best fit
Not established
Time
Not established

Evidence for 3 uses

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

healthy aging biomarkers

Biomarker support
Mixed Evidence

AKG is an alpha-ketoglutarate-dependent dioxygenase substrate influencing DNA demethylation and other epigenetic processes, and its tissue levels decline with age. One small open-label human trial reported reductions in DNA-methylation age markers, but there are no rigorous randomized trials, and methylation age is a biomarker rather than a clinical outcome.

Effect size
Preliminary; reported reduction in DNA-methylation age in one small trial
Time to effect
Months
Best fit
Early adopters tracking biological-age markers
Less likely
Anyone wanting demonstrated health or lifespan outcomes

Bottom line: Early biomarker signals only; no controlled human evidence of an aging benefit.

Evidence is mixed

Human data come from a single small open-label study without a randomized control group, so the biomarker finding is preliminary and unconfirmed.

SourceAsadi et al., 2020 — PMC· conflictingWang et al., 2020 — PMC· conflicting
SourceAsadi et al., 2020 — PMCWang et al., 2020 — PMC

lifespan and healthspan extension

Mechanism only
Mixed Evidence

Animal supplementation studies report extended healthspan and lifespan, reduced inflammation, and improved age-related markers with AKG. These findings are limited to model organisms and have not been demonstrated in humans, so any longevity claim is preclinical.

Effect size
Unproven in humans
Time to effect
Not established
Best fit
Not established

Bottom line: Lifespan benefits are shown only in animals; there is no human evidence.

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

muscle protein synthesis and recovery

Mechanism only
Mixed Evidence

As the keto-acid form of glutamate, AKG is central to amino acid and nitrogen metabolism, and it has been studied for muscle protein synthesis, wound healing, and nitrogen retention in critical illness. Human data are sparse and inconsistent, so benefits for muscle or recovery in healthy people are not established.

Effect size
Unproven in humans
Time to effect
Not established
Best fit
Not established

Bottom line: Mechanistically plausible for muscle and recovery, but human evidence is lacking.

SourceWernerman et al., 1987 — PMC

How it works

AKG is a central metabolic molecule with several important roles. In the Krebs cycle, it is converted to succinyl-CoA, producing NADH for energy generation. It is also the keto-acid form of glutamate, central to amino acid metabolism and nitrogen handling. Research suggests AKG serves as a substrate for several important enzyme families including alpha-ketoglutarate-dependent dioxygenases, which include the TET enzymes (involved in DNA demethylation), Jumonji-domain histone demethylases (involved in gene regulation), and prolyl hydroxylases (involved in oxygen sensing). Through these enzymes, AKG influences epigenetic regulation, gene expression, and cellular responses to stress. AKG levels decline with age in many tissues. Animal supplementation studies show extended healthspan and lifespan, reduced inflammation, and improvements in various age-related markers. Human evidence is much more limited, with one small open-label trial in middle-aged adults reporting reductions in DNA methylation age markers but no rigorous randomized trials. AKG has also been investigated for muscle protein synthesis, wound healing, and recovery from critical illness.

How to take it

1. Typical dose
1–3 g/day for general use (1 g/day calcium-AKG in the published human aging study)
2. Higher studied dose
4–12 g/day in some critical-care nitrogen-retention research
3. Timing
With meals
4. With food
With food to reduce GI upset and aid absorption
5. Split dosing
Morning and evening may keep levels more consistent
6. How long to try
Months to evaluate aging markers; weeks for recovery applications

What to track

GI tolerance
Calcium or sodium intake depending on salt form
Any recovery or performance measures if used for that

4 commercial forms

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

Calcium alpha-ketoglutarate

Popular for longevity applications. Provides additional calcium intake.

Provides AKG with calcium; the form used in the published human aging study.

Sodium alpha-ketoglutarate

Alternative form used in some clinical research.

Sodium salt; suitable for those avoiding excess calcium.

Arginine alpha-ketoglutarate (AAKG)

Common in pre-workout supplements. Marketed for nitric oxide and performance benefits, though evidence is limited.

Provides AKG plus arginine; marketed for athletic performance.

Ornithine alpha-ketoglutarate (OKG)

Pharmaceutical-grade combination used in some clinical nutrition applications.

Used clinically for nitrogen support in malnutrition and critical illness.

Safety

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

Common side effects

Mild gastrointestinal symptomsHeadacheOccasional flushing

Who should avoid it

  • Pregnant and breastfeeding women
  • People with cancer (consult oncologist)
  • People with kidney disease
  • Hypercalcemia (calcium-AKG) or sodium restriction (sodium-AKG)

Pregnancy & breastfeeding

Avoid in pregnancy and breastfeeding because safety is not established.

Interactions

Calcium-binding medicationsMinor

Calcium-AKG salt adds a calcium load that can affect these drugs

Sodium-sensitive conditionsMinor

Sodium-AKG salt contributes a sodium load

Food sources

Most foods

Amount
AKG is endogenously produced in cellular metabolism; specific dietary intake levels are not typically targeted
%DV
—

Choosing a product

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

Look for…

Salt form clearly stated (calcium, sodium, or arginine)
Disclosed elemental AKG dose
Third-party purity testing

Be skeptical of…

Reverses aging
Proven to extend lifespan
Anti-aging guarantees

Frequently asked questions

What does alpha-ketoglutarate do?⌄

AKG is a central metabolic molecule involved in energy production, amino acid metabolism, and as a cofactor for enzymes that regulate gene expression. It may decline with age, prompting supplementation research.

Will AKG help me live longer?⌄

Animal studies show lifespan and healthspan benefits. Human evidence is very limited - one small trial reported reduced epigenetic aging markers but no controlled human trials have demonstrated lifespan effects.

Which form of AKG should I take?⌄

Calcium AKG is the most-studied form for longevity applications. Arginine AKG is marketed for athletic performance. The choice depends on your goals and tolerance for the salt component.

Is AKG the same as glutamine?⌄

No. AKG is the keto-acid related to glutamate, while glutamine is the amide form of glutamate. They are metabolically related but distinct molecules with different applications.

How long until I see effects?⌄

AKG is taken with long-term outcomes in mind. Effects on aging biomarkers may take months to evaluate. Short-term effects on energy or recovery may appear within weeks if present at all.

References by claim

healthy aging biomarkers

Asadi et al., 2020 — PMC (2020) link

Wang et al., 2020 — PMC (2020) link

lifespan and healthspan extension

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

muscle protein synthesis and recovery

Wernerman et al., 1987 — PMC (1987) link

Track 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.