L-Phenylalanine

L-Phenylalanine Details

Specification: 98.5%HPLC

CAS No.: 63-91-2

Molecular Formula: C₉H₁₁NO₂

Packing: 25kg/drum

Storage: Stored in closed containers in a cool, dry, well-ventilated area.

What is L-Phenylalanine?

L-Phenylalanine is an essential aromatic amino acid that the human body cannot synthesize on its own — it must be obtained through diet or supplementation. It serves as the direct biosynthetic precursor to L-Tyrosine, which is subsequently converted into critical neurotransmitters and hormones including dopamine, norepinephrine (noradrenaline), epinephrine (adrenaline), and thyroid hormones (thyroxine, T4).

As a white crystalline powder with high purity (≥98.5% HPLC), our L-Phenylalanine meets USP/EP pharmaceutical standards and is suitable for use in dietary supplements, functional foods, and pharmaceutical formulations.

What's the Major Function of L-Phenylalanine?

1. Neurotransmitter Synthesis

L-Phenylalanine is the upstream building block in the catecholamine biosynthesis pathway:

• Dopamine: Supports motivation, reward, and motor coordination.
• Norepinephrine: Regulates attention, focus, and the fight-or-flight response.
• Epinephrine: Critical for energy mobilization and cardiovascular function under stress.

2. Mood & Cognitive Support

By supporting catecholamine production, L-Phenylalanine plays a key role in mood regulation, mental alertness, and stress response. It is frequently used in formulations targeting cognitive performance and emotional well-being.

3. Thyroid Hormone Precursor

L-Phenylalanine → Tyrosine → Thyroid hormones (T3/T4). Adequate phenylalanine intake supports healthy thyroid function and metabolic rate.

4. Protein Synthesis

As one of the 20 standard amino acids, L-Phenylalanine is incorporated directly into the protein structure of enzymes, hormones, and structural proteins throughout the body.

L-Phenylalanine Specification:

Application