L-Arginine is an amino acid precursor to nitric oxide, a gas with a vasodilating effect during training. This promotes increased blood flow to the muscle areas involved in training, allowing maximum muscle congestion to be achieved. It acts on testosterone, promoting the anabolic state of metabolism after training. Regular consumption of L-Arginine before training can also help develop lean muscle mass while increasing strength, endurance, and training capacity. Supplementation with L-Arginine also has a positive effect on muscle relaxation time. The capsules contain 1 gram of high-quality L-Arginine, L-Arginine hydrochloride, best suited to meet your bodys requirements.