L-phenylalanine, an essential amino acid, is a precursor of the amino acid tyrosine and a whole series of neurotransmitters and hormones. Phenylalanine is first converted to tyrosine, which becomes L-dopa, which converts to norepinephrine, a key neurotransmitter and an adrenal hormone. L-phenylalanine is also a direct precursor of PEA (phenylethylamine), another important neurotransmitter.
- Neurotransmitter Synthesis: Tyrosine, Derived From Phenylalanine, is a Precursor for the Synthesis of Neurotransmitters Such as Dopamine, Norepinephrine (Noradrenaline), and Epinephrine (Adrenaline).
- Hormone Production: Tyrosine Also Serves as a Precursor for the Production of Hormones, Including Thyroid Hormones and the Adrenal Hormones Norepinephrine, and Epinephrine.
- Essential Amino Acid: L-phenylalanine is Classified as an Essential Amino Acid, Meaning It Must Be Obtained Through the Diet Because the Body Cannot Produce It on Its Own.