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NOW Foods L-Arginine Double Strength is a conditionally essential basic amino acid involved primarily in urea metabolism and excretion, as well as in DNA synthesis and protein production.It is an important precursor of nitric oxide (NO) and thus plays a role in supporting normal blood vessel dilation.Uses

The pain reliever DLPA (D,L-phenylalanine) contains two forms of the amino acid phenylalanine. The "L" form is a natural substance found in Protein-rich foods; it's believed to bolster mood-elevating chemicals in the brain, such as dopamine and norepinephrine. The "D" form of phenylalanine, on the ...