Nitrix is a nutritional supplement made for bodybuilders by BSN. The supplement increases nitric oxide levels using a proprietary blend, which, according to BSN, improves endurance and performance when lifting weights.
HealthGuidance.org states that nitric oxide increases blood vessel diameter, a process called vasodilation, to improve blood flow to muscles. The improved blood flow leads to quicker recovery and faster muscle growth. Arginine alpha-ketoglutarate and arginine-ketoisocaproate are amino acids known to increase nitric oxide levels. HealthGuidance.org also warns that it is possible to overdose on these proteins. The symptoms of overdose include diarrhea, weakness and nausea. Anyone who experiences these symptoms after taking a supplement should seek medical attention.