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What's behind the substance everyone's talking about?
Calcium Alpha-Ketoglutarate (CaAKG)
Here you can find out what Calcium Alpha-Ketoglutarate (CaAKG) is, what role it plays in energy metabolism, and why the compound is increasingly becoming the focus of scientific research.
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Definition: What is Alpha-Ketoglutarate (AKG)?
Alpha-ketoglutarate (AKG) – also known as 2-oxoglutarate – is an organic acid naturally produced by the body. Your body synthesizes it and uses it as an intermediate in the citric acid cycle, a central metabolic pathway for energy production.¹,²
What's special about it: AKG accompanies you throughout your entire life – without you even noticing it. Every second, countless metabolic processes occur in your cells, in which AKG plays an important role. It is therefore not a foreign substance or a vitamin, but a natural component of your metabolism. It is continuously produced in the cells and directly processed further there. Therefore, dietary intake is not fundamentally necessary.¹,²
Without AKG, many of these metabolic processes could not run smoothly. The citric acid cycle would be interrupted, and cells would no longer be able to efficiently obtain energy from carbohydrates, fats, and proteins. This is precisely why AKG is one of the central building blocks of human metabolism.¹–⁵
However, its significance extends beyond energy metabolism. AKG is in close exchange with the amino acid glutamate, thus linking carbon and nitrogen metabolism. Among other things, it is involved in the formation of glutamate and glutamine and thus plays an important interface function in metabolism: ¹,²
What is Calcium Alpha-Ketoglutarate (CaAKG)?
Calcium Alpha-Ketoglutarate (CaAKG) is the calcium salt of alpha-ketoglutaric acid. It consists of two components: the body's own AKG and calcium, which forms the salt as a counterion. When CaAKG enters an aqueous solution, it breaks down into calcium and AKG again – the released AKG corresponds to the molecule that your body also produces itself.¹,⁶
You might be asking yourself now: If my body can produce AKG itself, why does CaAKG even exist?
The reason is very simple: Pure AKG is comparatively unstable. As a calcium salt, it can be stored much better and processed into capsules, tablets or powder. Therefore, AKG is usually used in the form of CaAKG in both scientific studies and dietary supplements.⁶,⁷
It is important to note: CaAKG is not a different active ingredient than AKG. Rather, it is a stable form that releases AKG again after absorption. The actual metabolic building block thus remains the same.¹,⁶
AKG vs. CaAKG – What's the difference?
These two terms are often confused, but they do not describe the same thing.
AKG (Alpha-Ketoglutarate) is the molecule your body produces itself and plays an important role in energy metabolism.¹,²
CaAKG (Calcium Alpha-Ketoglutarate) is the compound of AKG with calcium. This form is often used in dietary supplements because it is stable and can be easily processed into capsules or powder. After ingestion, the AKG is released and becomes available to the body as the same substance it produces itself.¹,⁶
In short:
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AKG = endogenous metabolic molecule
-
CaAKG = compound of AKG and calcium
- The difference mainly lies in the dosage form, not in the actual substance.¹,⁶
| Feature | Alpha-Ketoglutarate (AKG) | Calcium Alpha-Ketoglutarate (CaAKG) |
|---|---|---|
| What is it? | Naturally occurring intermediate of the citric acid cycle. | Compound of alpha-ketoglutarate and calcium. |
| Occurrence | Produced by the body itself and found in all body cells. | Mainly used as a dietary supplement. |
| Function | Component of energy metabolism and amino acid metabolism. | Serves as a source of alpha-ketoglutarate. |
| Research | Being investigated for its role in metabolism. | Being researched in connection with energy metabolism, regeneration, and healthy aging, among other things. |
All information is based on the studies listed in the source directory.
Why AKG is important for your cell energy
Every cell in your body needs energy – whether you're moving, concentrating at work, or recovering after exercise. For this energy to be supplied, many metabolic processes must interact precisely.
This is where AKG comes in. As an intermediate product of the citrate cycle, it is part of a biochemical cycle that gradually converts nutrients from food into usable energy.¹–⁵
This process produces energy-rich molecules such as NADH and FADH₂. These transport electrons to the respiratory chain, where ATP (adenosine triphosphate) is ultimately formed – the most important energy carrier for your cells.³–⁵
AKG itself does not supply energy.¹,⁵ Instead, it ensures that the individual metabolic steps in the citrate cycle run smoothly.¹–⁵ At the same time, it performs tasks in amino acid metabolism, thus connecting various metabolic pathways.¹,²
This central role makes AKG much more than a simple intermediate product.¹,²,⁵ It is an important hub in metabolism – and this is precisely why the molecule has increasingly attracted attention in recent years, both in sports and performance research and in the field of longevity.⁷–⁹
Learn more about NAD+, NADH, and their role in cellular energy metabolism – in our blog article on this topic.
AKG, NADH, and ATP – how are they related?
Anyone interested in cellular energy or longevity will sooner or later come across the terms AKG, NADH, and ATP. Although they are often mentioned together, they perform different tasks in metabolism.³–⁵
You can think of them as a team:
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AKG is an important component of the citrate cycle and ensures that central metabolic processes can take place.¹–⁵
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NADH and FADH₂ transport the energy obtained in this process within the cell.³–⁵
- ATP is ultimately the form in which this energy is directly available to the cells.³–⁵
AKG itself therefore does not provide energy and does not replace either NADH or ATP. Rather, it is part of a closely networked system in which all three molecules work together so that your cells are continuously supplied with energy.¹–⁵
Display
- Holistic formula for the NAD system in mitochondrial energy metabolism
- Contains nicotinamide riboside (NR), NAD⁺, and NADH – building blocks of various areas of the NAD system
- Supplemented with coenzyme Q10 & alpha-ketoglutarate – building blocks of the citrate cycle & respiratory chain
- Supplemented with antioxidant micronutrients and polyphenols
- Developed with doctors and experts
Why is CaAKG getting so much attention lately?
Calcium alpha-ketoglutarate (CaAKG) is one of the substances that has received increasing attention in recent years in both sports nutrition and longevity research. This is based on its natural role in energy metabolism and its involvement in various cellular metabolic processes.¹–⁵
Sports and Performance
In sports, there is great interest in substances that could support energy metabolism or regeneration. Since AKG is a natural component of the citrate cycle and amino acid metabolism, CaAKG is also being intensively discussed in this context. Initial scientific studies are exploring, among other things, possible correlations with physical performance and recovery after exertion.⁷
Longevity and Healthy Aging
CaAKG is also playing an increasingly important role in longevity research. This was triggered, among other things, by experimental studies that investigated the possible connection between AKG and biological aging processes.⁸,⁹ As a result, CaAKG has become one of the most discussed substances in the field of healthy aging.
Energy metabolism
As AKG is a natural component of the citrate cycle, it plays a central role in cellular energy production. It is involved in the metabolic processes that contribute to the formation of NADH, FADH₂, and ultimately ATP—the most important energy carrier in our cells.¹–⁵ It is precisely this fundamental function that makes AKG an interesting research subject in the field of energy metabolism.
Recovery after physical exertion
Not only the strain itself, but also the subsequent recovery is crucial for the body. This is why CaAKG is also discussed in the context of regeneration. Initial studies provide evidence that AKG is involved in metabolic processes that may play a role during this phase.⁷
Well documented
Interest in calcium alpha-ketoglutarate (CaAKG) has increased significantly in recent years. At the same time, it is important to distinguish between well-substantiated findings and research approaches.
Today, there is a broad scientific consensus on the role of alpha-ketoglutarate (AKG). As an endogenous intermediate of the citrate cycle, AKG is an integral part of energy metabolism and is also closely linked to amino acid metabolism. These functions are considered well-described and have been scientifically proven for many years.¹–⁵
The situation is different when it comes to the question of what significance an additional intake of CaAKG might have. In recent years, numerous studies have been published that deal with topics such as sports, regeneration, and healthy aging. The results are promising but differ significantly in terms of study design, dosage, and the groups of people studied.⁷–⁹
Therefore, the current study situation cannot be reduced to a simple statement. Rather, a more comprehensive picture is gradually emerging of the role CaAKG could play in various physiological contexts.⁵,⁷–⁹
With each new study, the scientific understanding of this endogenous metabolic building block grows. At the same time, the existing evidence shows how important it is to always consider individual results within the overall context of research.⁵,⁷–⁹
When might Calcium Alpha-Ketoglutarate (CaAKG) be particularly interesting?
Since AKG plays a central role in energy metabolism, CaAKG is primarily discussed in situations where metabolism is particularly challenged. These include physical exertion, intensive training phases, or life stages in which the body's natural performance decreases.⁵,⁷
AKG also receives increased attention with advancing age. Studies show that the body's own AKG concentration can decrease over the course of life. This raised the question of whether an additional intake of CaAKG might be beneficial in certain phases of life.⁸,⁹
Furthermore, CaAKG is often used by people who want to support their energy metabolism or an active lifestyle. However, whether and to what extent supplementation offers benefits depends on many individual factors and is still being scientifically investigated.⁷–⁹
Calcium alpha-ketoglutarate, simply summarized
- AKG (alpha-ketoglutarate) is an endogenous intermediate of the citric acid cycle and an important component of energy metabolism.¹–⁵
- CaAKG (calcium alpha-ketoglutarate) is the stable salt form of AKG and is frequently used in scientific studies and dietary supplements.⁶,⁷
- The role of AKG in metabolism is well-established scientifically.¹–⁵
- Furthermore, the potential significance of supplementary CaAKG intake in various application areas is being investigated.⁵,⁷–⁹
- Research is continuously evolving and consistently providing new insights.⁷–⁹
More blog articles on this topic
This encyclopedia entry is based on carefully researched sources:
Bibliography & Sources
- Wu N, Yang M, Gaur U, Xu H, Yao Y, Li D, et al. (2016). Alpha-Ketoglutarate: Physiological Functions and Applications. Biomolecules & Therapeutics, 24(1), 1–8. https://doi.org/10.4062/biomolther.2015.078
- Zdzisińska B, Żurek A, Kandefer-Szerszeń M. (2017). Alpha-Ketoglutarate as a Molecule with Pleiotropic Activity: Well-Known and Novel Possibilities of Therapeutic Use. Archives of Immunology and Therapy Experimental, 65, 21–36. https://doi.org/10.1007/s00005-016-0433-x
- Alberts B, Johnson A, Lewis J, et al. (2015). Molecular Biology of the Cell. 6th Edition. Garland Science.
- Heinrich PC, Müller M, Graeve L. (2014). Löffler/Petrides Biochemistry and Pathobiochemistry. Springer Spektrum.
- Iñigo M, et al. (2021). α-Ketoglutarate in Metabolism and Signaling.
- Stielow C, et al. (2023). Calcium Alpha-Ketoglutarate: Chemistry, Stability and Applications.
- Xu X, et al. (2024). Calcium Alpha-Ketoglutarate Supplementation: Current Evidence and Potential Applications.
- Asadi Shahmirzadi A, et al. (2020). Alpha-Ketoglutarate, an Endogenous Metabolite, Extends Lifespan and Compresses Morbidity in Mice. Cell Metabolism, 32(3), 447–456.e6.
- Sandalova T, et al. (2023). Review on α-Ketoglutarate, Metabolism and Healthy Aging.
