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Item #: LEFDLP
Reg. Price: $18.75
Our Price: $14.06

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Life Extension D,L-Phenylalanine, 500mg, 100 Caps

L-phenylalanine is an essential amino acid that can be converted to L-tyrosine in the liver. L-tyrosine can be converted by neurons in the brain and in the adrenal glands to dopamine, norepinephrine, and epinephrine (adrenaline) 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. D,L-phenylalanine is a 50/50 mixture of its two stereoisomers.

Life Extension's mission is simply to help you live a healthier, longer life. They are at the forefront of medical research, constantly looking for ways to prolong youth, health, and life. They have been at it for more than 34 years, investing more than $140 million to find therapies and technologies that could lead to lifesaving cures for the diseases of aging.

Life Extension insists on purchasing only the highest quality raw materials from all over the world, primarily from leading US, Japanese and European sources. They go one step further by using advanced analytical methods, such as high-performance liquid chromatography and gas chromatography/mass spectrometry, to ensure Their products meet label claims for potency and purity. Life Extension tests its raw materials using US Pharmacopeia and other exacting pharmaceutical assay standard.

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.


May cause anxiety, high blood pressure, and headache. Do not use if you have phenylketonuria. Do not use phenylalanine or tyrosine if you have cancer or muscular dystrophy. Because phenylalanine can elevate blood pressure in hypertensives, consult your healthcare practitioner if you have hypertension. Insomnia may occur from overstimulation if taken too close to bedtime.




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