Now L-Arginine Double Strength 1000 mg - 60 Tablets

Protein Metabolism*
Nitric Oxide Precursor*
Muscle Maintenance*

Arginine 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 the dilation of blood vessels.*

This product has twice the L-Arginine (1,000 mg per tablet) 

The L-Arginine used in this product is pharmaceutical grade.