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Manufacturer: Life Extension L-phenylalanine is an essential amino acid which 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 to dopamine and norepinephrine (noradrenaline), hormones which 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 cofactors (vitamins B6 and C) are included.99-107* 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 L-phenylalanine or L-tyrosine.* L-tyrosine is also a precursor of two thyroid hormones. D-phenylalanine is unique among amino acids because the D-form (normally not found in life) has biological activity that is different from its L-stereoisomer. D, L-phenylalanine is a 50/50 mixture of the two stereoisomers. Supplement Facts Serving Size 1/4 teaspoon (approx. 725 mg) | Servings Per Container 138 | Amount Per Serving | L-Phenylalanine | 725 mg | Other ingredients: none. | This product contains NO milk, egg, fish, peanuts, crustacean shellfish, soybeans, tree nuts, wheat, yeast, gluten, corn, or rice. Contains NO sugar, and no artificial sweeteners, flavors, colors, or preservatives. |
Dosage and Use - Suggested dose is 500-1000 mg L-phenylalanine in the morning or afternoon preferably on an empty stomach, or as recommended by a healthcare practitioner.
Caution Cancer patients should avoid taking L-phenylalanine and L-tyrosine. Certain cancers, such as melanoma, depend on these amino acids to fuel their growth. Supplemental use of L-phenylalanine and L-tyrosine may raise or normalize blood pressure. Insomnia may occur from over stimulation if taken too close to bedtime. Individuals with the rare metabolic disorder Phenylketonuria should avoid phenylalanine. Warnings - Keep out of reach of children.
- Do not exceed recommended dose.
- Do not purchase if outer seal is broken or damaged.
- If you have a bad reaction to product discontinue use immediately.
- When using nutritional supplements, please inform your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.
About Life Extension
Life Extension is a global authority on health, wellness and nutrition as well as a provider of scientific information on anti-aging therapies. They supply only the highest quality nutritional supplements, including minerals, herbs, hormones and vitamins.
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