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Origin: Supplements or food such as beef, poultry, pork, fish, milk, yogurt, eggs, cheese, and soy products.

Also Known As:

Overview: L-Phenylalanine is an essential amino acid that can be readily converted into the amino acid tyrosine. L-Phenylalanine must be obtained through diet or outside supplementation. It has been shown through studies that it helps make proteins and brain chemicals such as L-dopamine, epinephrine, norepinephrine, and thyroid hormones for optimal brain development and growth.

Common Dosage: 33 mg/kg body weight/day


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