L-Citrulline is an amino acid the body converts into L-Arginine and then nitric oxide, a signalling molecule that relaxes and widens blood vessels.
Because the conversion happens gradually, L-Citrulline is generally associated with sustained rather than spiked blood-flow support.
JellyRock's materials name L-Citrulline as a key ingredient but don't publish its individual milligram amount per gummy.