Dietary supplement. Free form. An essential amino acid. L-Phenylalanine, an essential amino acid, is a precursor of the amino acid tyrosine, and a whole series of neurotransmitters and hormones.

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Dietary supplement. Free form. An essential amino acid. L-Phenylalanine, an essential amino acid, is a precursor of the amino acid tyrosine, and a whole series of neurotransmitters and hormones.

  • An Essential Amino Acid. Phenylalanine is first converted to tyrosine, which becomes L-dopa, which converts to norepinephrine, a key neurotransmitter and an adrenal hormone.
  • Suggested Use. 1 to 2 tablets daily.
  • Suitable For Vegetarians: Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, preservatives or artificial color, flavor or fragrance.
  • Over 40 Years of Trust. Source Naturals was created in 1982 by CEO Ira Goldberg to support everyone’s potential to enjoy optimal health.
  • Manufactured in the USA. Manufactured in Scotts Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration (FDA)

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