Short answer: L-Arginine HCl is an amino acid the body converts into nitric oxide, a molecule that signals blood vessels to relax, while L-Citrulline Malate converts into L-Arginine within the body, providing more sustained support for nitric oxide levels than arginine alone.
Why pairing direct and indirect arginine sources matters
L-Arginine HCl supplies nitric oxide's raw material directly, while L-Citrulline Malate acts as a second, delayed source that regenerates more arginine over time — two complementary, not redundant, contributions.
Why this pairing supports the formula's "sustained availability" claim
L-Citrulline converts to L-Arginine gradually, helping maintain more consistent nitric oxide support across the day rather than a single spike — the specific mechanism behind this pairing.
💡 Worth knowing: these two ingredients, alongside L-Arginine Alpha-Ketoglutarate, make up BloodPril's full 500 mg amino-acid blend.