People with certain conditions should avoid using phenylalanine, including those with schizophrenia (Tardive dyskinesia, a movement disorder, may develop). You should avoid the supplement if you have sensitivity to phenylalanine or a condition in which your body can't break down phenylalanine.
Also be careful taking phenylalanine if you have:
It is unknown whether this supplement is safe in women who are pregnant or breastfeeding.
- High blood pressure
- Trouble sleeping
- Anxiety or other psychiatric problems