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D,L-Phenylalanine (500 mg 100 vcapsules)*
Life Extension
D,L-Phenylalanine (500 mg 100 vcapsules)* Life Extension

D,L-phenylalanine is an essential amino acid supporting brain function, sending messages to support endorphins resulting in positive mood.
L-Phenylalanine (500 mg-50 tabs)*
Source Naturals
L-Phenylalanine (500 mg-50 tabs)* Source Naturals

L-Phenylalanine, an essential amino acid, is a precursor of the amino acid tyrosine, and to 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.
DL-Phenylalanine (500 mg 60 capsules)
Solaray Vitamins
DL-Phenylalanine (500 mg 60 capsules) Solaray Vitamins

DL-Phenylalanine 500 mg is the 50/50 Blend of D-Phenylalanine & L-Phenylalanine, a dietary supplement.
L-Phenylalanine 500 mg (60 Caps)
NOW Foods
L-Phenylalanine 500 mg (60 Caps) NOW Foods

Nervous System Support Supports Positive Mood* Free-Form L-Phenylalanine is an essential amino acid that can be readily converted into 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.* ; Related Products
D,L-Phenylalanine Plus (with Vitamin C) (100 grams powder)*
Life Extension
D,L-Phenylalanine Plus (with Vitamin C) (100 grams powder)* Life Extension

L-tyrosine can be converted by neurons in the brain support and result in a calming feeling.
L-Phenylalanine 500 mg (120 Caps)
NOW Foods
L-Phenylalanine 500 mg (120 Caps) NOW Foods

Nervous System Support Supports Positive Mood* Free-Form L-Phenylalanine is an essential amino acid that can be readily converted into 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.* ; Related Products
True Focus (90 V-caps)
NOW Foods
True Focus (90 V-caps) NOW Foods

NOW
L-Phenylalanine (500 mg-100 tabs)*
Source Naturals
L-Phenylalanine (500 mg-100 tabs)* Source Naturals

L-Phenylalanine, an essential amino acid, is a precursor of the amino acid tyrosine, and to 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.
L-Tyrosine 500 mg (60 Caps)
NOW Foods
L-Tyrosine 500 mg (60 Caps) NOW Foods

L-Tyrosine is a non-essential amino acid that plays an important role in the production of the neurotransmitters dopamine and norepinephrine. Neurotransmitter Support, Pharmaceutical Grade (USP), Supports Mental Alertness, Healthy Glandular Function
L-Tyrosine (500 mg 100 capsules)
Jarrow Formulas
L-Tyrosine (500 mg 100 capsules) Jarrow Formulas

Tyrosine has anti-aging benefi ts for maintaining dopamine production as we grow older, thus improving cognitive and physical performance.* It is also useful for those who want a boost in alertness and focus (can replace coffee in the morning), or who are under constant stress and want to maintain healthy hormone levels and mental alacrity.
L-Tyrosine 500 mg (120 Caps)
NOW Foods
L-Tyrosine 500 mg (120 Caps) NOW Foods

Neurotransmitter Support Pharmaceutical Grade (USP) Supports Mental Alertness Healthy Glandular Function* L-Tyrosine is a non-essential amino acid that plays an important role in the production of neurotransmitters dopamine and norepinephrine.  In addition, because L-Tyrosine is necessary for the synthesis of thyroid hormone and epinephrine (adrenaline), L-Tyrosine supports healthy glandular function and stress response.*  Related Products
L-Tyrosine 750 mg (90 Caps)
NOW Foods
L-Tyrosine 750 mg (90 Caps) NOW Foods

L-Tyrosine is a non-essential amino acid that plays an important role in the production of the neurotransmitters dopamine and norepinephrine. Neurotransmitter Support, Pharmaceutical Grade (USP), Supports Mental Alertness, Healthy Glandular Function

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