Some considerations for people taking phenylalanine include the following:
Since the manufacturing of supplements such as phenylalanine is not closely regulated, it is important to choose a trustworthy manufacturer of your phenylalanine supplements. It is a good idea to look for the "USP" symbol, since this means that the supplement has been tested and contains the right ingredients in the right amounts.
If you have any chronic health problems or take any prescription medications, you should check with your healthcare provider before taking phenylalanine supplements.
If you are unsure about anything related to your dosage or phenylalanine dosing in general, please talk with your healthcare provider.