NOW Foods Arginine and Citrulline 500 mg per 250 mg combines two synergistic amino acids that together provide superior nitric oxide support compared to either alone. L-Arginine is a direct precursor to nitric oxide, which relaxes blood vessel walls to improve circulation and oxygen delivery to muscles. L-Citrulline is converted to arginine in the kidneys, effectively extending and amplifying the nitric oxide signal for sustained vascular support. Athletes use this combination to enhance pumps, endurance, and recovery.

240 veg capsules per bottle for an extended supply. Non-GMO and GMP-certified.