What Does the L Mean in L-Tyrosine and L-Theanine?
What Does the L Mean in L-Tyrosine and L-Theanine?
by Vitamins and Supplements FAQs • Apr 17, 2011

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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(Note: as per industry regulations, we cannot and will not answer medical questions, make treatment or diagnosis recommendations or comment on disease inquiries. Such questions must be answered by your doctor or professional healthcare provider.)
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