Arginine Alpha-Ketoglutarate (AAKG) is a salt formed by combining two molecules of the amino acid L-arginine with one molecule of alpha-ketoglutarate, a natural compound in the body's energy cycle. This pairing is designed to improve how efficiently arginine is absorbed and used, compared to plain arginine alone. It became popular in sports nutrition as a way to boost nitric oxide levels and support both performance and recovery.

Arginine is a direct building block for nitric oxide, a molecule that tells blood vessels to relax and widen, allowing more blood and oxygen to reach working muscles. Alpha-ketoglutarate plays its own role as a key player in the Krebs cycle, helping cells generate energy more efficiently, and it may also help reduce ammonia buildup during intense exercise. Together, the two components are thought to support both the circulatory and metabolic demands of physical activity.

AAKG is most commonly sold as a standalone powder or capsule, and is frequently included in pre-workout formulas. Powder forms allow for flexible dosing and faster absorption, while capsules offer convenience. Most clinical research has used doses between 3–12 grams per day, with pre-workout timing being the most common protocol.

• Exercise performance and endurance
• Muscle pump and blood flow during workouts
• Strength and power output
• Muscle recovery after exercise
• Fatigue during intense training
• Blood pressure support
• Nitric oxide production
• Aerobic capacity and oxygen delivery

• Exercise-induced fatigue buildup (by supporting ammonia clearance and energy metabolism during training)

AAKG is a synthesized compound not found in food. However, you can support natural arginine and nitric oxide production through your diet. Beets and beet juice are among the richest food sources of dietary nitrates, which the body converts to nitric oxide through a similar pathway. Watermelon provides citrulline, which the body readily converts to arginine. Pumpkin seeds, soybeans, lentils, turkey, and chicken breast are all high in dietary arginine itself. Leafy greens like spinach and arugula also provide nitrates that support blood vessel relaxation. Pairing these foods with regular exercise gives your nitric oxide system a natural workout. Foods to limit: Very high-protein meals immediately before dosing — Competing amino acids in a large protein meal can reduce arginine absorption and blunt the acute nitric oxide response..

• Nausea or stomach discomfort (most common, especially on an empty stomach)
• Loose stools or diarrhea at higher doses
• Low blood pressure or dizziness (particularly when combined with other vasodilators or antihypertensives)
• Headache (from rapid vasodilation)
• May trigger herpes outbreaks in individuals with HSV-1 or HSV-2 (arginine promotes viral replication)
• Potential worsening of asthma symptoms at very high doses in susceptible individuals

• Recommended daily: 3–6 grams per day for general use; athletic performance studies have used up to 12 grams per day in divided doses. Most pre-workout formulas provide 3–4 grams per serving.
• Best time of day: 30–60 minutes before exercise for the performance pump effect. On non-training days, morning or early afternoon is preferable to keep clear of sleep.
• With or without food: Best taken on an empty stomach or with a light snack to maximize absorption. A large protein-rich meal can compete with arginine uptake and reduce its effectiveness.
• Time to effect: Acute vasodilation within 60–90 minutes of a dose; consistent performance benefits typically emerge after 4–8 weeks of daily use.
• How long to take it: Can be used continuously during active training periods. Some athletes cycle off for 4–6 weeks after 8–12 weeks of use to maintain sensitivity, though strict cycling is not strongly supported by current evidence.