AKG
Content by: OpenSupplement Editorial Team | Medical review: pending | Last updated: April 13, 2026
TL;DR
AKG is a natural metabolic compound that showed dramatic lifespan extension in animal studies
One controversial human trial suggested biological age reversal via DNA methylation markers
Functions as Krebs cycle intermediate supporting cellular energy production
Well-tolerated with minimal side effects, mostly mild GI discomfort
Expensive at $40-60 monthly for unproven benefits in humans
Best for: longevity enthusiasts willing to experiment with emerging science
What it is
Alpha-ketoglutarate (AKG) is a naturally occurring compound that plays a central role in cellular energy production as an intermediate in the Krebs cycle — the metabolic pathway that converts nutrients into usable energy. Every cell in your body produces AKG as part of normal metabolism, but levels decline with age.
AKG captured significant attention after studies showed it could extend lifespan by up to 50% in various animal models, from worms to mice. The mechanism appears to involve improved mitochondrial function and cellular maintenance processes. However, translating these dramatic animal results to humans remains highly speculative, with limited clinical data available to support the longevity claims that have made AKG popular in anti-aging circles.
What the research says
Theoretical Neuroprotection As a Krebs cycle intermediate, AKG theoretically supports brain cell energy production and may help maintain mitochondrial function in neurons. Age-related decline in cellular energy production contributes to cognitive decline, making AKG an attractive theoretical intervention.
Rejuvant Trial Controversy The most cited human study involved the Rejuvant formulation containing AKG plus vitamins, which showed apparent biological age reversal based on DNA methylation patterns [1]. However, this observational study didn't measure actual cognitive function, memory, or other brain performance markers — only molecular age indicators.
Practical Reality No published RCTs have tested AKG's effects on cognitive function, memory, or neurodegenerative disease progression. While the cellular energy support mechanism is plausible, we lack evidence that supplemental AKG meaningfully impacts brain function in healthy adults or those with cognitive decline.
Energy Metabolism Support AKG's role in the Krebs cycle suggests it could theoretically improve cellular energy production and metabolic efficiency. This has led to speculation about benefits for metabolic syndrome components like insulin sensitivity and fat metabolism.
Negative Human Trial The most rigorous study testing AKG's metabolic effects found disappointing results. A 12-week RCT in healthy adults using 1g daily showed no improvements in endothelial function, blood pressure, cholesterol, or other cardiovascular risk markers [2]. This well-designed study suggests AKG may not translate its cellular benefits to measurable metabolic improvements.
Current Evidence Gap No published studies have specifically tested AKG in people with metabolic syndrome, diabetes, or obesity. While the theoretical mechanism remains plausible, the negative results in healthy adults raise questions about practical metabolic benefits from supplementation.
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AKG on Amazon
Safety
AKG appears well-tolerated based on limited human data. The most common side effect is mild gastrointestinal discomfort including nausea or stomach upset, particularly when taken on an empty stomach. As a natural metabolite produced by the body, AKG is unlikely to cause serious adverse effects, though long-term safety data in humans remains limited given the supplement's recent popularity.
Interactions
• No documented drug interactions - limited human data available • Diabetes medications - theoretical interaction possible due to metabolic effects, monitor blood sugar (minor) • Blood thinners - no known interactions but insufficient data (minimal concern)
Dosing
General Use: 500-1000mg daily, typically taken with food to minimize GI upset. Most studies used 1g daily.
Longevity Protocol: Some anti-aging enthusiasts use 1-2g daily based on animal study dosing conversions, though human equivalency is unclear.
Timing: Take with meals to improve tolerance. Some prefer splitting doses (500mg twice daily) to maintain steady levels.
Most products are available as capsules or powder. Quality varies significantly between manufacturers, so choose reputable brands with third-party testing.
Cost
AKG is expensive relative to its limited human evidence, typically costing $40-60 monthly for a 1g daily dose. The high price reflects both manufacturing costs and market demand driven by longevity enthusiasm rather than established clinical benefits. Some longevity-focused formulations containing AKG cost even more, often exceeding $100 monthly.
The bottom line
AKG represents an intriguing but highly speculative supplement based on impressive animal studies and one controversial human trial. While the cellular energy production mechanism is scientifically sound, we lack convincing evidence that supplemental AKG provides meaningful health benefits in humans. At $40-60 monthly, it's expensive for unproven benefits. AKG might appeal to longevity enthusiasts willing to experiment with cutting-edge science, but most people would get better value from established interventions like exercise, sleep optimization, and proven supplements with stronger human evidence.
References
- Demidenko O, Barardo D, Budovskii V, et al. Rejuvant®, a potential life-extending compound formulation with alpha-ketoglutarate and vitamins, conferred an average 8 year reduction in biological aging, after an average of 7 months of use, in the TruAge DNA methylation test. Aging (Albany NY). 2021;13(24):24485-24499.
- Filip R, Possemiers S, Heyerick A, et al. Twelve-week administration of alpha-ketoglutarate does not improve markers of endothelial function and cardiovascular risk factors in healthy adults. Appl Physiol Nutr Metab. 2018;43(1):39-47.
Sources for this page include published meta-analyses, systematic reviews, and NIH dietary supplement fact sheets. All claims reflect the evidence as of early 2026.
This is not medical advice. Consult your healthcare provider before starting any supplement, especially if you take medications.