L-Phenylalanine

As a supplement, L-Phenylalinine is an essential amino acid that is converted to L-Tyrosine via the liver. L-Tyrosine is important for the production of the neurotransmitters dopamine and noepinephrine. Stress and overwork deplete L-Tyrosine and L-Phenylalinine levels. Lowered L-Phenylalinine may cause depressed mental states and low energy. Supplementing with L-Phenylalinine may result in improved mental wellbeing.