L-Phenylalanine USP


L-Phenylalanine is sourced both from dietary intake and supplementation. It naturally occurs in a variety of foods including beef, poultry, pork, fish, milk, yogurt, eggs, cheese, and soy products. Its presence in these food sources highlights its importance in a balanced diet.

Also Known As

L-Phenylalanine is also recognized by several other names:

  • Fenilalanina (Spanish)
  • Phénylalanine (French)
  • Fenilalanin (Turkish)


This essential amino acid is utilized in various applications, primarily within the dietary supplement industry. It serves as a building block for protein synthesis and is involved in the production of brain chemicals, making it crucial for dietary supplements aimed at enhancing cognitive function and overall brain health. Additionally, its role in the synthesis of important neurotransmitters makes it a valuable ingredient in nutritional products designed to support mood and neurological function.


L-Phenylalanine plays a critical role in human health as an essential amino acid, meaning it cannot be synthesized by the body and must be obtained through diet or supplementation. Its primary function includes the production of tyrosine, another amino acid that is a precursor to vital neurotransmitters and hormones. Studies have shown that L-Phenylalanine is important for:

  • The synthesis of proteins and several brain chemicals, including dopamine, epinephrine, and norepinephrine.
  • Supporting optimal brain development and growth.
  • Contributing to the production of thyroid hormones.

Common Dosage

The recommended dosage for L-Phenylalanine is 33 milligrams per kilogram of body weight per day. This dosage guideline helps ensure adequate intake for its physiological benefits.


L-Phenylalanine is an indispensable amino acid that serves multiple vital functions in the body. From being a fundamental component in protein synthesis to its crucial role in the production of neurotransmitters and hormones, its importance cannot be overstated. Key points about L-Phenylalanine include:

  • It is essential for the synthesis of proteins and critical neurotransmitters.
  • Must be obtained through diet or supplementation due to its essential nature.
  • Plays a significant role in brain health and development.

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