An amino acid the body converts toward nitric oxide, tied to blood flow research.
L-Citrulline gets converted by the body into L-arginine and eventually nitric oxide, a compound involved in relaxing and widening blood vessels.
It's one of the better-studied ingredients in the men's performance space, with research on blood flow and exercise capacity.
No Supplement Facts label was available to confirm the exact amount used in this formula, so we can't compare it directly to clinical research doses.