A preliminary study suggests that L-arginine, when combined with L-lysine, can help to reduce anxiety symptoms in subjects who have performance anxiety when speaking in public (Jezova et al., 2005). More studies are needed to confirm this preliminary finding.
Reference:
Subchronic treatment with amino acid mixture of L-lysine and L-arginine modifies neuroendocrine activation during psychosocial stress in subjects with high trait anxiety. Jezova D, Makatsori A, Smriga M, Morinaga Y, Duncko R. Nutr Neurosci. 2005 Jun;8(3):155-60.
