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Go to the shopDL-Phenylalanine is a 50/50 blend of the essential amino acids D-Phenylalanine and L-Phenylalanine. While L-Phenylalanine is converted to L-Tyrosine in the liver (a precursor to dopamine, norepinephrine and epinephrine), D-Phenylalanine may help support the body’s production of healthy, good hormones. Thus, DL-Phenylalanine is intended to support mood, energy levels, and nervous system health in addition to providing stress support