L-Arginine AKG in BloodPril: Benefits, Studies and Side Effects

AAKG is the second of three ingredients in the BloodPril blend. The strip above shows the label-order ceiling and the doses used in studies. See the ingredients overview for how the three parts fit together.

It is two compounds joined into one powder. L-arginine is an amino acid the body uses to build protein and make nitric oxide. Alpha-ketoglutarate, or AKG, is a small molecule from the cycle your cells use to turn food into energy.

Joined together, they make a salt that dissolves well in water. Sports supplement makers sell it for the muscle “pump” during workouts.

The BloodPril label lists it as L-Arginine (Alpha-Ketoglutarate dihydrate). Dihydrate means two water molecules are locked into the crystal. That water adds weight but has no effect.

The human AAKG research is about exercise. It did not test blood pressure, and the results are mixed.

In one study, trained men took 12 g of AAKG a day for 8 weeks (Campbell et al., 2006). Some strength and power measures improved, and it appeared safe in that group. A later study gave a single 3 g dose before lifting (Wax et al., 2012). It did not improve strength or endurance.

For blood pressure, the evidence comes from plain arginine instead. Across 11 trials with 387 people, 4 to 24 g a day of L-arginine lowered pressure about 5 / 3 mmHg versus placebo (Dong et al., 2011). Those trials did not use the AKG form.

All three deliver arginine. What changes is the partner molecule and how much of the weight is arginine itself.

BloodPril uses two arginine forms, AAKG and HCL, behind L-citrulline malate. The brand does not explain why. Our L-arginine HCL page covers the other form.

Mostly for marketing reasons tied to exercise. Arginine is the raw material cells use to make nitric oxide, and nitric oxide widens blood vessels. Workout brands link that to a fuller muscle pump, and AAKG became a standard label word in that market.

The theory is sound, but the steps between swallowing arginine and more nitric oxide are not simple. A good share of oral arginine is used up in the gut and liver. That is one reason researchers became interested in citrulline, which raised blood arginine more efficiently in one study (Schwedhelm et al., 2008).

The AKG half has its own job in energy use, but the studies we cite did not show it adds a blood pressure effect. For a wider look at this product group, read nitric oxide supplements explained.

Each capsule holds 250 mg or less. AAKG is second in a 500 mg blend, and blend parts are listed by weight, heaviest first (21 CFR 101.36). The second part cannot outweigh the first, so it is at most half the blend.

The real figure may be lower, and part of it is AKG and water. The table compares the ceiling with the two exercise study doses.

AAKG behaves like arginine in the body, so the same cautions apply. Reported side effects of arginine include stomach upset, bloating, diarrhea, and dizziness when pressure dips. The 8-week study at 12 g a day found it appeared safe in healthy trained men (Campbell et al., 2006).

The bigger risk is with medicines. With nitroglycerin, sildenafil or blood pressure drugs, arginine might make pressure drop too low (Mayo Clinic, L-arginine).

AAKG earned its name in gyms, not in blood pressure clinics. Its studies used 3 to 12 g a day for exercise, and one capsule of BloodPril holds 250 mg at most. No trial has tested BloodPril itself.

That does not make the capsule pointless. It is one of three related amino acids in a simple daily routine. Track what matters with a validated upper-arm cuff, the way the American Heart Association describes (AHA, Home monitoring), and share the log with your doctor.