α-Ketoglutaric Acid(AKG)

What does AKG do for the body?

AKG (α-Ketoglutaric Acid) is a natural substance in the human body, and its main benefits for the body are easy to understand:

Boosts energy: It helps convert the sugar, fat and protein we eat into energy that

cells can use directly, reducing fatigue and keeping you energetic.

Supports anti-aging: It activates cellular autophagy to clear damaged "cell waste"

and eliminates harmful free radicals, slowing down cellular aging.

Aids metabolism: It helps regulate the body's metabolic balance and supports the

normal function of cells and organs.

Protects cells: It supports the repair and health of body cells, helping maintain

overall physical well-being.

Mechanism of Action

α-Ketoglutaric acid (AKG) is a natural intermediate in the energy-producing Krebs cycle, helping cells convert food into usable energy (ATP). It also captures and detoxifies harmful ammonia generated from protein breakdown, converting it into harmless substances. Additionally, AKG supports the production of key amino acids (like glutamine and arginine) and activates antioxidant pathways (SIRT1/Nrf2) that reduce oxidative stress and slow aging.

1. Sports Nutrition & Dietary Supplements

Positioning: AKG is an important component of sports nutrition drinks and health supplements. It reduces ammonia toxicity during exercise by binding excess ammonia and participating in nitrogen metabolism, while promoting muscle repair and growth. Compared with taurine, AKG directly replenishes energy as a key TCA cycle intermediate; its formulation has no sugar requirements, which is more favorable for fat reduction and muscle gain. Animal studies show that AKG significantly improves muscle mass, exercise endurance, grip strength, and cold tolerance, counteracting agerelated sarcopenia.

2. Food Industry

Positioning: AKG is used as a food additive with dual functions – flavor enhancement and preservation – playing a role in improving taste and extending shelf life.

3. Cosmetics & Skincare

Positioning: Utilized for its antioxidant properties in skin care products to promote skin health, reduce signs of aging, and as a deodorant (reduce or mask body odor).

Research evidence:

Moisturizing & antiwrinkle: An antiaging cream containing αKG showed positive effects on skin hydration and barrier function. Fermented rice liquid containing αKG significantly improved skin hydration and antiwrinkle function in clinical trials.

Reduces wrinkle formation: αKG increases collagen production by activating the prolidase pathway, thereby reducing UVBinduced wrinkle formation.

4. Animal Nutrition & Feed

Positioning: AKG shows great potential in animal nutrition due to its roles in energy metabolism, antioxidant defense, antiinflammatory activity, and immune modulation.

Research evidence:

Weaned piglets: Adding 500–1000 g/ton AKG to the diet significantly reduces diarrhea incidence, improves nutrient digestibility and amino acid utilization, and enhances overall health.

Rabbit hair follicle development: AKG supplementation promotes hair follicle development and improves production performance and antioxidant capacity.

Antimetabolic stress: AKG alleviates oxidative stress induced by highfat/highfructose diets and modulates hematological parameters in a tissuedependent and dietdependent manner.

5. Pharmaceutical Intermediates & Organic Synthesis

AKG is widely used as a pharmaceutical intermediate and in organic synthesis and fine chemicals. It serves as a precursor for the synthesis of various amino acids, carbohydrates, and proteins, with broad applications across food, pharmaceutical, feed, and chemical industries.

AKG is a naturally occurring metabolite in living organisms. Within a defined dosage range, it is essentially nontoxic and does not increase nitrogen load. It is a nontoxic shortchain carboxylic acid with high stability in aqueous solutions.

1 Natural Origin & Safety

AKG is a naturally occurring metabolite in living organisms. Within a defined dosage range, it is essentially non-toxic and does not increase nitrogen load. It is a non-toxic short-chain carboxylic acid with high stability in aqueous solutions.

2 High Water Solubility & Bioavailability

AKG exhibits very high solubility in water (approx. 200 mg/mL) and dissolves rapidly in aqueous solutions. As a water-soluble substance, AKG does not need to be taken with food for good absorption, offering a significant advantage in dietary supplements and functional foods.

3 Multiple Production Routes Available

AKG can be produced by chemical synthesis, microbial fermentation, or wholecell biotransformation.

Chemical synthesis – mature process but complicated, high cost, and environmental concerns.

Microbial fermentation – environmentally friendly but low yield and purity.

Whole-cell biotransformation – eco-friendly, high specificity, safe. Using L-glutamic acid as substrate, AKG yield can reach 180 g/L with a molar yield >95%, showing great application potential.

Q1: What is α-Ketoglutaric acid?
α-Ketoglutaric acid (AKG) is a naturally occurring organic acid in living organisms and a key metabolic intermediate of the TCA (Krebs) cycle. It plays central roles in cellular energy production, amino acid metabolism, ammonia detoxification, and antioxidant defense, earning it the description "the hub linking carbon and nitrogen metabolism."

Q2: Is AKG naturally present in the human body?
Yes, AKG is a natural metabolite in human cells, synthesized in various tissues including the liver, skeletal muscle, and brain. As a normal intermediate of the TCA cycle, it participates in daily energy metabolism.

Q3: What is the difference between AKG and ornithine-α-ketoglutarate (OKG)?
AKG and OKG are different compounds. AKG is the free acid form of αketoglutaric acid; OKG is a salt formed between ornithine and αketoglutaric acid. They differ in metabolic pathways and clinical applications and should not be confused.

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