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NOW Foods L-Phenylalanine 500mg

120 capsules
NOW Foods L-Phenylalanine 500mg

L-Phenylalanine is one of the essential amino acids for healthy brain functions. The body uses it to produce tyrosine, an important ingredient to form proteins and the neurotransmitters dopamine and norepinehprine. Phenylalanine naturally supports positive mood and normal pain relief.

Supplement Facts

Serving Size: 1 Capsule
Servings Per Container: 120


Amount Per Serving

% Daily Value

L-Phenylalanine (Free-Form)

500 mg


† Daily Value not established.

Other Ingredients: Cellulose (capsule).

Suggested Use

Take 1 capsule 1 to 3 times daily as needed, preferably between meals.


For adults only. Consult Doctor if pregnant/nursing, taking medication, or if you have a have a medical condition. Persons with high blood pressure should consult a Doctor before using.


  • L-Phenylalanine is a natural brain support nutrient. It is able to cross the blood-brain barrier, producing direct nourishing effects for the central nervous system. Phenylalanine benefits the brain by helping in the production of the neurotransmitters dopamine, epinephrine, and norepinephrine.
  • Phenylalanine is essential for mood support. Mood disorders especially depression is strongly implicated in the deficiency of the neurotransmitters dopamine and serotonine. By providing additional source of tyrosine, phenylalanine supplements may help correct dopamine and serotonin deficiency in the brain.
  • The amino acid L-phenylalanine promotes healthy pain tolerance, even in conditions associated with chronic pain. When pain lasts for weeks, its already considered as chronic pain. Chronic pain is often a manifestation of chronic conditions like fibromyalgia, arthritis, menstrual cramps, and back pain.
  • L-Phenylalanine benefits healthy brain functions like memory and concentration. As a precursor to neurotransmitters, phenylalanine produces indirect effects to alertness, memory, focus, learning, and other important cognitive functions.
  • Phenylalanine promotes healthy skin in people with vitiligo. Vitiligo is a condition that causes loss of skin pigment, causing white patches to appear on the skin.

L-Phenylalanine is one of the “building blocks of proteins” or amino acids. It belongs to the group of essential amino acids since the body derives its supply from the diet or from L-Phenylalanine supplements. Foods rich in L-phenylalanine are protein-rich foods including fish, pork, beef, beans, dairy products, and soy products. In the body, phenylalanine is primarily converted to another amino acid called tyrosine. Tyrosine is then utilised to synthesise important proteins including the neurotransmitters dopamine, epinephrine, and norepinephrine. These brain chemicals regulate mood, cognitive functions, appetite, energy, and many other biological processes. The benefits of L-phenylalanine for a healthy mood have been its most remarkable properties. In people with mood disorders like depression, there is a notable deficiency of the neurotransmitter dopamine and serotonin. Correcting this imbalance by providing the brain with phenylalanine as precursor to tyrosine may help optimise dopamine and serotonin brain concentrations. L-phenylalanine has also been shown to support healthy pain threshold and tolerance in people suffering from chronic pain. Experts suggest that L-phenylalanine helps regulate the body’s Endogenous Analgesia System (EAS). The EAS is dramatically involved in reducing pain sensations by suppressing nerve transmissions on the pain pathways.