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.

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.

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SUGGESTED USAGE
Take 1/2 level teaspoon daily on an empty stomach, or as recommended by a healthcare practitioner.

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

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Supplement Facts Serving Size 1/2 level teaspoon (1.5 g) Servings Per Container 66 Amount per serving %DV Vitamin C (as magnesium ascorbate) 500 mg ** Vitamin B6 (pyridoxine HCl) 100 mg ** Magnesium (as magnesium ascorbate) 38 mg ** L-tyrosine 700 mg ** other ingredients: none.

**Daily Value not yet established.

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GUARANTEE/SHIPPING INFORMATION
L-Tyrosine Plus Powder - is shipped in a discrete, unmarked package. Orders are processed immediately and usually take about 3 to 5 working days to be received. We do ask that you try it for 2 to 3 weeks to feel the full effects. Any information received is used only for order processing and shipping purposes. Your information, such as e-mail address, will never be disclosed to a third party.

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