About this ingredient
L-Citrulline is a naturally occurring amino acid involved in the body's urea cycle and amino-acid metabolism. It can be converted into L-arginine, which serves as a substrate for nitric oxide production.
Because of its relationship with nitric oxide and blood-flow pathways, L-Citrulline is widely used in sports nutrition and pre-workout formulations. Research has examined its potential role in exercise performance, muscle function and blood-flow-related outcomes, although findings are not consistent across all studies and applications.
L-Citrulline is available as a standalone nutritional ingredient as well as in combination products. It should be distinguished from citrulline malate, which contains both citrulline and malic acid.