Formal Name: 2-amino-3-phenyl-propanoic acid
Supplement Forms: Pills, food, liquid

Recommended Daily Allowance

  • Infants: (0 to 12 Months) N/A
  • Children: (1 to 13 years) N/A
  • Adolescents: (14 to 18 Years) N/A
  • Adults: (19 and Older) N/A
  • Lactating Women: N/A
  • Pregnant Women: N/A

Notes: There is no established RDA for the Phenylalanine amino acid.

Additional Information

Phenylalanine is an essential amino acid required from daily dietary intake. It is critical as a component needed to produce various hormones and neurotransmitters. Three forms of phenylalanine are known: L-phenylalanine - useful for its nutritional value; D-phenylalanine - a mirror image of the L version, useful for pain reduction; And DL-phenylalanine a combination of both the L and D form.

Bodily Functions Phenylalanine Assists

Phenylalanine largest influence is on the central nervous system's regulation of appetite and satiety. Its effect on thyroid secretion and its role in increasing secretion of cholycystokinin in the intestinal track contribute to a higher feeling of satiety. In this sense, it is used therapeutically as an appetite suppressant, particularly as a short term intervention in the obese population. Additionally, the body uses phenylalanine by converting it into important neurotransmitters such as dopamine and norepinephrine.

Symptoms Of Deficiency:
  • Fatigue
  • Mental fogness
  • Loss of appetite
  • Reducd mental alertness
  • Decreased memory
  • Stunted growth
Foods High In Phenylalanine

Phenylalanine can be found in most foods that contain proteins. Additional sources include legumes, groundnuts, pistachio nuts, almonds, whole grains, piyal seeds, milk and dairy products.

Ailments That Phenylalanine Helps Against:
  • Helps treat attention deficit disorder
  • Contributes in treatment of symptoms of Parkinson's disease
  • Reduces back, tooth and headache pain as an analgesic
  • Aids in treatment of depression
Side Effects And Toxicity

Taking phenylalanine doses of 5,000 mg per day can result in irritability, insomnia, high blood pressure and severe nerve damage. Prolonged use of high doses can result in brain damage and ultimately death. Persons who are hypertensive should only consider doses of about 100 mg per day and should consult their doctor.