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Acetyl-L-carnitine Acetyl-L-carnitine is an amino acid that helps the brain produce energy. Click here to view our L-carnitine range 4. L-theanine L-theanine is an amino acid found in green tea. L-theanine works by increasing the levels of GABA, a neurotransmitter that helps to promote relaxation Click here to view our L-theanine range If you're looking for ways to improve your memory and focus,