Phenylalanine may help to address the following conditions:
addiction
Robert C. Atkins, M.D. reported prescribing phenylalanine supplements to patients trying to break the caffeine habit. Atkins recommended 500 to 1,000 mg of phenylalanine on an empty stomach, or half that amount taken with a matching amount of the amino acid L-tyrosine, which has "similar chemistry."
Alzheimer's disease
Phenylalanine is a precursor to tyrosine, which in turn produces the neurotransmitter norepinephrine. Both of these transformations require a sufficient supply of vitamin C, suggesting that supplementary phenylalanine and vitamin C might increase norepineprhine -- which some believe is of value to AD patients.
brain fog
Phenylalanine is the main constituent of neurotransmitters promoting alertness.
depression
Phenylalanine proved as helpful as the tricyclic antidepressant imipramine in a double-blind study. The amino acid is most helpful in cases of depression involving apathy and lethargy, and has the advantage of near-immediate effects.
fatigue
Phenylalanine quickly improves some cases of fatigue.
inflammation
Phenylalanine reportedly helps to control inflammation in doses of 1 to 3 grams daily.
lethargy
Phenylalanine can help to overcome lethargic depression in amounts of 250-1000 mg.
Parkinson's disease
One animal study suggests that D-phenylalanine may improve symptoms of Parkinson's disease such as walking and speech difficulties
nervous system disorders
One animal study suggests that D-phenylalanine may improve symptoms of Parkinson's disease such as walking and speech difficulties
pain
Phenylalanine helps relieve pain by increasing endorphins rather than blocking pain receptors or reducing inflammation. Phenylalanine should not be used by people with heart disease or cancer, since it can promote the division of cancer cells.
vitiligo
Studies have found that L-phenylalanine can help to reverse symptoms of vitiligo when applied as a cream containing copper.
 

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