Workout Supplements L-Arginine – OKG Ornithine alpha-ketoglutarate(OKG) is a salt made up of the amino acid ornithine and alpha-ketoglutarate. It has an impact on the release of growth hormones and protein synthesis. L-Arginine – GKG Glutamine alpha-ketoglutarate(GKG) provides the amino acid L-glutamine. It helps support energy production as well as protein synthesis. L-Arginine – A-KIC Arginine ketoisocaproate(AKIC) boosts nitric oxide production leading to improved endurance and recovery time. L-Arginine – A-AKG Arginine alpha-ketoglutarate(AAKG) is a salt of the amino acid arginine and alpha-ketoglutaric acid. It increases nitric oxide production which increases blood flow and results in improved endurance and recovery time.