4 articles
Arginine
Arginine (C6H14N4O2), also called L-arginine, is a basic, proteinogenic amino acid that is conditionally essential in humans and a precursor of nitric oxide, urea, and creatine.
Histidine
Histidine (His, H) is one of the nine essential amino acids, obtained from meat, fish, eggs, and soy, whose imidazole side chain makes it a versatile catalytic residue, metal ligand, and precursor of histamine.
L-arginine
L-arginine, a nitrogen-rich amino acid and nitric oxide precursor (CAS 74-79-3), supplies about 4-5 g/day from food; oral Observed Safe Level 20 g/day; FDA food additive and GRAS; weak performance evidence.
Lysine
Lysine (Lys or K) is an essential amino acid the body cannot make and must obtain from food; it is the limiting amino acid in cereal grains.