L-Citrulline
A non-protein amino acid that is converted to arginine in the urea cycle. L-citrulline and citrulline salts are often added to NO (nitric oxide) boosters to enhance NO production. Citrulline may be a better source of supplemental arginine than arginine itself. When taken together, arginine and citrulline work synergistically to enhance NO production and improve blood...
L-Arginine
A conditionally-essential amino acid that’s a component of proteins, substrate for nitric oxide (NO) synthesis, and urea cycle intermediate. Experimentally, supplemental L-arginine has been shown to increase resting (but not exercise-induced) growth hormone production and improve exercise tolerance in patients with congestive heart...
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