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.
100 to 200 milligrams once daily
What Research Shows
Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.
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.
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:
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.
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
EBSCO Information Services is fully accredited by URAC. URAC is an independent, nonprofit health care accrediting organization dedicated to promoting health care quality through accreditation, certification and commendation.
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.
To send comments or feedback to our Editorial Team regarding the content please email us at email@example.com. Our Health Library Support team will respond to your email request within 2 business days.