L-Citrulline for Blood Pressure Regulation

Research suggests that l-citrulline may support blood pressure regulation primarily through its role as a precursor to l-arginine, which the body uses to produce nitric oxide, a molecule that helps relax blood vessels. The most directly relevant evidence comes from an animal study showing that l-citrulline supplementation prevented blood pressure increases in mice following kidney removal, an effect linked to preserving l-arginine availability and counteracting elevated levels of ADMA, a compound that interferes with nitric oxide production. The remaining studies in this set are largely neutral in direction and do not directly test l-citrulline for blood pressure outcomes, instead addressing related topics such as nitric oxide measurement, drug metabolism involving NOS enzymes, and cardiovascular mechanisms in animal models of hypertension. Taken together, the body of evidence reviewed here is limited in its direct applicability to human blood pressure regulation, as it relies heavily on animal and mechanistic research rather than human clinical trials, and readers should weigh these preliminary findings accordingly.