Originally bought this to help with withdrawal symptoms when I decided to go cold turkey off an anti depressant the doctor put me on for a couple of months. The withdrawals were horrible and this helped me through it all. Wouldn't have made it without these and Calms Forte. Great to use to help calm down your nerves and prevent panic attacks, also helps to relax you to sleep well. Start with the lower dose of 100 or 150mg. These are a blessing and I am never without them.......just in case. The benefits of Suntheanine What exactly does Suntheanine do? It has unimaginable benefits like: It is relaxing. It is calming, without making you feel sleepy. It decreases the side effects of ephedrine and caffeine. It reduces Hypertension and sleep disturbances which are associated with high doses of caffeine. It helps with mental clarity. It makes you feel more positive. It lowers pre menstrual symptoms. It reduces irritability. It diminishes nicotine addiction. It works to increase the efficacy of anti-cancer drugs like doxorubicin, idarubicin and adriamycin. And this is not empirical or anecdotal experience, but is backed by years of study and research in Japan. All the research is based on the effects of Suntheanine, 100 percent pure l-theanine and not an extracted version