Phenylalanine
Supplement Forms/Alternate Names:
• D-phenylalanine, DL-Phenylalanine, L-phenylalanine
Introduction
Phenylalanine is an essential amino acid found in meat, dairy, and beans. It has been used to treat chronic pain and ease symptoms of depression. Phenylalanine can be taken as a pill or powder. It can also be applied to the skin as a cream.
Dosages100 to 200 milligrams once daily
What Research Shows
Not Enough Data to Assess
Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.
Safety Notes
It is likely safe for most adults to take L-phenylalanine in small doses for a short time. Not enough studies have been done to say whether it is safe to use D-phenylalanine. Women who are pregnant or trying to become pregnant or who are breastfeeding should not take high amounts of phenylalanine.
Interactions
Talk to your doctor about any supplements or therapy you would like to use. Some can interfere with treatment or make conditions worse, such as:
References [ + ]
A. Multiple Sclerosis
A1. Wade DT, Young CA, et al. A randomised placebo controlled exploratory study of vitamin B-12, lofepramine, and L-phenylalanine (the “Cari Loder regime”) in the treatment of multiple sclerosis. J Neurol Neurosurg Psychiatry. 2002;73(3):246-249.
B. Vitiligo
B1. Szczurko O, Boon HS. A systematic review of natural health product treatment for vitiligo. BMC Dermatol. 2008 May 22;8:2.
Last reviewed July 2019 by EBSCO NAT Review Board
Eric Hurwitz, DC
Last Updated: 5/1/2020