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Phenylalanine Supplements

L-Phenylalanine is an essential, nine-carbon amino acid and is a precursor to the amino acid tyrosine. Because tyrosine is necessary for the synthesis of proteins and the production of the neurotransmitters dopamine and norepinephrine, phenylalanine is an extremely important nutrient that must be obtained through the diet or supplementation.

Phenylalanine occurs in two chemical forms: L-phenylalanine, a natural amino acid found in proteins; and its mirror image, D-phenylalanine, a form synthesized in a laboratory. Some research has involved the L-form, others the D-form, and still others a combination of the two known as DL-phenylalanine.

In the body, L-phenylalanine is converted into another amino acid called Tyrosine. Tyrosine in turn is converted into L-dopa, norepinephrine, and epinephrine, three key neurotransmitters (chemicals that transmit signals between nerve cells). Because some antidepressants work by raising levels of norepinephrine, various forms of phenylalanine have been tried as a possible treatment for depression.

D-phenylalanine (but not L-phenylalanine) has been proposed to treat chronic pain. It blocks enkephalinase, an enzyme that may act to increase pain levels in the body.

Best Selling Phenylalanine Supplements

Now Foods L Phenylalanine 500 mg 120 Caps
$14.99 $8.24 Our Price
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Now Foods L Phenylalanine 500 mg 60 Caps
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Source Naturals DL Phenylalanine DLPA 120 tabs 375mg
$18.50 $9.43 Our Price
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Source Naturals DL Phenylalanine DLPA 30 tabs 750mg
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Source Naturals DL Phenylalanine DLPA 60 tabs 375mg
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Source Naturals DL Phenylalanine DLPA 60 tabs 750mg
$17.98 $9.16 Our Price
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Source Naturals L-Phenylalanine 100 tabs 500 mg
$11.98 $6.11 Our Price
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Source Naturals L-Phenylalanine 3.53 oz powder 100 grams
$28.98 $14.78 Our Price
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Source Naturals L-Phenylalanine 50 tabs 500 mg
$6.75 $3.44 Our Price
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