vasodilation
3 interactions related to vasodilation
l-arginine + l-citrulline
L-arginine is the direct precursor to nitric oxide, but a large share of an oral dose is degraded by intestinal arginase and first-pass liver metabolism, so plasma levels peak quickly and fall within an hour or two. L-citrulline largely bypasses that metabolism and is converted to L-arginine in the kidneys, sustaining the rise for longer. Taken together they raise plasma arginine higher and for longer than either alone, supporting nitric-oxide-dependent effects.
citrulline + arginine
Citrulline and arginine are both precursors to nitric oxide, the molecule that relaxes blood vessels and improves blood flow to working muscle. Each has a different limitation, and taking them together addresses both at once.
nicotine + adenosine
Nicotine produces sympathomimetic cardiovascular effects (faster heart rate, higher blood pressure, peripheral vasoconstriction) that can complicate the periprocedural setting in which intravenous adenosine is used for supraventricular tachycardia or pharmacologic cardiac stress testing. Direct interference with adenosine itself is mechanistic and largely shown in animal models; the better-documented antagonist that smokers commonly co-ingest is caffeine.