What is the Difference between L-Threonine and L-Theanine? : What is the Difference between L-Threonine and L-Theanine? Updated on March 25, 2010 What is the Difference between L-Threonine and L-Theanine? Both L-Threonine and L-Theanine are amino acids, and they are easily confused because their names only differ by a couple of letters. Even vitamin shop clerks confuse them and can bring you l-theanine powder instead of l-threonine capsules or vice versa. Below I’ve listed the main differences between l-threonine and l-theanine. L-threonine is an amino acid typically found in meat (especially heart, skeletal muscles) and in the nervous system. You shouldn’t confuse it with L-theanine, an amino acid found uniquely in green tea, which is a very different substance. What Does L-Threonine Do? L-Threonine is a precursor of glycine synthesis in the spinal cord and is essential for a healthy nervous system. The supplement plays an important role in the formatio...
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