How long does it take for L-theanine to wear off?
                                
                                
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                                    4 min read                                
                            
                                On average, the noticeable effects of L-theanine last for about 3 to 8 hours, influenced by dosage and metabolism. This natural amino acid, found abundantly in green tea, is known for promoting a state of calm alertness without causing drowsiness.