Citrulline jẹ L-enantiomer ti citrulline.O ni ipa kan bi EC 1.14.13.39 (nitric oxide synthase) inhibitor, oluranlowo aabo, nutraceutical, micronutrients, metabolite eniyan, Escherichia coli metabolite, Saccharomyces cerevisiae metabolite ati metabolite Asin.O jẹ enantiomer ti D-citrulline kan.O jẹ tautomer ti L-citrulline zwitterion.