we have been using l-theanine for this with great success. my husband takes 300mg every 5 hours - 7am/12pm/5pm/11pm. i hold off giving the last one because i want it to last through the night as much as possible. i understand that the effective dose is 1500mg every 24 hrs. but we are working up as he has just had a heart issue and don't want to interfere with his heart drugs. my research indicates that it is actually good. certainly in his case since he has panic attacks which gradually thicken the walls of the heart....that can't be good! his cortisol levels are high therefore so is his adrenaline. those who have followed me will know that he had terrible hallucinations from a drug which after six months of living hell, were stopped overnight with large doses of niacin which we continued for six months until the drug was out of his system. Abram Hoffner's work.