What is the difference between L-theanine and L-Threonine?
                                
                                
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                                    3 min read                                
                            
                                Over 50% of the total free amino acids in tea plants consist of L-theanine, making tea a primary source. Meanwhile, L-Threonine is one of the nine essential amino acids that our bodies cannot produce. This fundamental difference in their origin and metabolic role explains why L-theanine is used for relaxation and L-Threonine is vital for protein synthesis.