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D,L-Phenylalanine (500 mg 100 capsules) - LifeExtension -

L-phenylalanine is an essential amino acid that can be converted to L-tyrosine by a complex biochemical process which takes place in the liver..

Ingredients & Description

LifeExtension- Nutritional Supplements, Antiaging, Health and Nutrition

D,L-Phenylalanine Capsules 500 mg

D,L-Phenylalanine Capsules 
500 mg, 100 capsules 
Item Catalog Number:

L-phenylalanine is an essential amino acid that can be converted to L-tyrosine by a complex biochemical process which takes place in the liver.

L-tyrosine can be converted by neurons in the brain and in the adrenal medulla of the adrenal glands to dopamine, norepinephrine (noradrenaline), and epinephrine hormones that are depleted by stress, overwork and certain drugs. By replenishing norepinephrine in the brain, mental energy levels are enhanced and a feeling of contentment often occurs. Because of the liver conversion necessary for L-phenylalanine to have these effects, L-tyrosine is often faster acting. In addition, the conversion step from L-tyrosine to norepinephrine may be enhanced if the co-factors (vitamins B6 and C) are included.

Cells in the adrenal medulla synthesize and secrete norepinephrine and epinephrine. Since both norepinephrine and epinephrine can cause smooth muscle (arterial) contraction, care with blood pressure should be taken when supplementing with L-phenylalanine or L-tyrosine.

L-tyrosine is also a precursor of two thyroid hormones.

Those who supplement with NAC should drink six to eight glasses of water daily to prevent cysteine renal stones. Cysteine renal stones are rare but do occur.

Supplement Facts

Serving Size 1 capsule

Servings Per Container 100

Amount Per Serving


500 mg

Other ingredients: gelatin, vegetable stearate.

This product contains NO milk, egg, fish, peanuts, crustacean shellfish (lobster, crab, shrimp), soybeans, tree nuts, wheat, yeast, gluten, corn, or rice. Contains NO sugar, and no artificial sweeteners, flavors, colors, or preservatives.

Dosage and Use

Take one capsule daily on an empty stomach in the morning, or as recommended by a healthcare practitioner.

Best utilized if taken with the co-factors vitamins B6 and C.

SKU: 34
UPC: 737870034100
Distributed or manufactured from Life Extension. See more Life Extension products.
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