Yes, because green tea is high in L-Theanine, but make sure you get decaffeinated green tea. You’re actually better off just taking L-Theanine supplements. It boosts Alpha waves, GABA and Seratonin in your brain, making you feel relaxed without sedation, and reduces Glutamate overactivity too (reduces blocking and hyper-arousal when stressed). I take it with Ashwaghanda 👍🏼