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What Does the L Mean in L-Tyrosine and L-Theanine?

L- in front of the amino acid (ex: L-Tyrosine) means that the amino acid is in its free form.  The L- tells us that the amino acid is not attached to other amino acids with peptide bonds forming a chain called a protein.  L- also tells us that the amino acid is on its own and in the form that your body would put it in so that you can absorb it.  L- means free-form.

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