superior labs - pure l-theanine non-gmo, no additives - 250mg, 90 vegetable capsules - powerful formula for healthy sleep and mood - dietary supplement for calming and ​relaxation superior labs "l-theanine is an analog of the amino acids l-glutamine and l-glutamic acid and is derived primarily from tea leaves. l-theanine has been shown to effectively bring on relaxation without inducing drowsiness, and relieve mental and physical tension.*