Description – L-phenylalanine is an essential amino acid that acts as a catalyst in the creation of tyrosine, which processes hormones. It also aids in the formation of neurotransmitters like dopamine, epinephrine and norepinephrine. In addition to its extensive role within the body, L-phenylalanine is an effective supplement for overall health and well-being. Function – Phenylalanine is used for depression, attention deficit-hyperactivity disorder (ADHD), Parkinson’s disease, chronic pain, osteoarthritis, rheumatoid arthritis, alcohol withdrawal symptoms, and a skin disease called vitiligo.