L-phenylalanine is an essential amino acid which can be converted toL-tyrosine by a complex biochemical process which takes place in theliver. L-tyrosine can be converted by neurons in the brain to dopamineand norepinephrine (noradrenaline), hormones which are depleted bystress, overwork and certain drugs. By replenishing norepinephrine inthe brain, mental energy levels are enhanced and a feeling ofcontentment often occurs. Because of the liver conversion necessary forL-phenylalanine to have these effects, L-tyrosine is often fasteracting. In addition, the conversion step from L-tyrosine tonorepinephrine may be enhanced if the cofactors (vitamins B6 and C) areincluded.99-107*
Cells in the adrenal medulla synthesize and secrete norepinephrineand epinephrine. Since both norepinephrine and epinephrine can causesmooth muscle (arterial) contraction, care with blood pressure shouldbe 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 differentfrom its L-stereoisomer. D, L-phenylalanine is a 50/50 mixture of thetwo stereoisomers.
Serving Size 1 capsule
Servings Per Container 100
D,L-phenylalanine
500 mg
Other ingredients: magnesium stearate, gelatin, and water.
This product contains NO sugar, yeast,wheat, gluten, corn, or dairy. Contains NO artificial color,sweeteners, flavors or preservatives.
Suggested dose is 500 to 1000 mg in the morning or afternoon.
More may be necessary for depression or pain.*
These products are best utilized when taken on an empty stomach mixed with juice or water.
Adequate cofactors (vitamins B6 and C) should also be taken if not included with the product.
Cancer patients should avoid taking L-phenylalanine and L-tyrosine.Certain cancers, such as melanoma, depend on these amino acids to fueltheir growth. Supplemental use of L-phenylalanine and L-tyrosine mayraise or normalize blood pressure. Insomnia may occur from overstimulation if taken too close to bedtime. Individuals with the raremetabolic disorder Phenylketonuria should avoid phenylalanine.
