Phenylalanine is a one of the few amino acids that can directly affect brain chemistry by crossing the blood-brain barrier.Phenylalanine is used to cure depression, attention deficithyperactivity disorder (ADHD), Parkinson's disease, chronic pain, osteoarthritis, rheumatoid arthritis, alcohol withdrawal symptoms, and a skin disease called vitiligo [24].
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Ghiamati et al. (2017) studied this question.
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