L-Phenylalanine Capsules

L-phenylalanine is an essential amino acid.✝

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Bottle of 120 caps x 600mg



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What is L-phenylalanine?

L-phenylalanine is the natural form of Phenylalanine (Phe). Phenylalanine is an essential amino acid, a building block of many proteins and a precursor to tyrosine and thyroid hormones.1 The word “essential” means that the body cannot synthesize it and therefore Phenylalanine must be included in the diet.

Phenylalanine is naturally found in many foods, including eggs, fish, chicken, pork, nuts and cheese. Nowadays it can also be obtained as a dietary supplement for healthy cognitive function.

L-phenylalanine appears to influence the synthesis and release of dopamine, epinephrine and norepinephrine (collectively called catecholamines) neurotransmitters in the brain.1 All of these neurotransmitters play an important role in optimising cognitive functions, such as memory, mood, mental energy and alertness.

Key benefits:

  • Stress relief
  • Mood enhancer
  • Increases alertness
  • Better concentration

Mechanisms of action:

Upon ingestion Phenylalanine is easily absorbed and transported to the brain where it crosses the blood-brain barrier (BBB) and is then converted to neurotransmitters.

Recommended dosage of L-phenylalanine:

The recommended daily dosage of L-phenylalanine is 600 mg.

Side effects:

L-Phenylalanine is generally considered to be a safe and well-tolerated dietary supplement. However, the recommended dose should not be exceeded as it may lead to some side effects, including headaches. L-phenylalanine supplements are not recommended for pregnant women, people with high blood pressure and those taking monoamine oxidase inhibitors (MAOIs).

Serving size: 1 capsule

Servings per bottle: 120

Amount per serving: L-phenylalanine 600 mg

Other ingredients: Magnesium Stearate; Silicon Dioxide

This product is free from: Artificial Flavours, Colours & Preservatives, Lactose, Yeast & Gluten

Suitable for: Vegetarians and Vegans


  • Dietary supplements should not be used as a substitute for a well-balanced and healthy diet.
  • Store in a cool dry place, out of reach of children.
  • Do not use if you are pregnant or breastfeeding.


  1. Tyrosine, phenylalanine, and catecholamine synthesis and function in the brain
  1. Effects on the diet on brain neurotransmitters


✝ These statements have not been evaluated by the Food and Drug Administration (FDA) The above products are not intended to diagnose, treat, cure or prevent any disease. You should consult a physician before taking a new product or a supplement. This product should not be taken by pregnant or nursing mothers, people suffering from cardiovascular disease or those under 18 years of age.

Any studies cited here are not conclusive and are limited to their closed environment nature; they might not determine ones experience with a supplement, due to a large number of unaccounted variables falling outside the scope of such studies.

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