Alpha-Ketoglutarate

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.

Common supplement doses are 1-3 grams per day for general use, depending on salt form. Calcium AKG used in the published human longevity study was 1 gram per day. Higher doses (4-12 grams) have been used in some research, particularly for nitrogen retention in critical care. There is no established RDA.

Take with meals to reduce GI upset and improve absorption. Splitting daily doses (morning and evening) may be preferred for consistent levels. Effects on aging markers or longevity outcomes, if any, may take months to evaluate. Effects on muscle or recovery applications may be assessed within weeks.

AKG supplements are generally well tolerated based on limited human use. Side effects may include mild gastrointestinal symptoms, headache, and occasional flushing. The specific salt form contributes additional considerations (sodium load, calcium load, etc.). Long-term safety data beyond 1-2 years are limited.

Salt-specific interactions apply: calcium AKG with calcium-binding medications, sodium AKG with sodium-sensitive conditions. AKG itself has limited well-characterized drug interactions. Theoretical interactions with medications affecting cellular energy metabolism, epigenetic regulation, or amino acid metabolism. May affect blood ammonia levels in liver disease.