Twinlab L-Arginine Description: Easier to Swallow and Assimilate Gluten Free L-arginine is a free-form amino acid that is needed to create both creatine and urea, a waste product that is necessary for the removal of toxic ammonia from the body. While the body typically manufactures enough l-arginine, it is considered a semi-essential amino acid as supplementation is sometimes needed. Arginine is a precursor to nitric oxide, which causes relaxation of the blood vessels, and also plays a key role in the production of protein. Free Of Tablet binders and coatings. Added flavorings, salt, artificial sweeteners, colorings, preservatives or salicylates. Disclaimer These statements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease.