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Item #00326 500 mg 100 Tablets 1 per serving Out of stock 01253
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L-Tyrosine, 500 mg 100 tablets: Source Naturals is a supplement/vitamin for you if you are interested in

Product Details

L-tyrosine is an amino acid that can be converted to dopamine, norepinephrine and epinephrine (adrenaline). These hormones are often reduced by stress, overwork and certain drugs and need to be replenished. Norepinephrine, for example, enhances mental energy levels that often induce a feeling of contentment. The conversion step from L-tyrosine to norepinephrine may be enhanced if the co-factors (vitamins B6 and C) are included.  

L-tyrosine also functions as a precursor to thyroid hormones, encephalins and melanin.

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

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Supplement Facts

Supplement Facts

Serving Size 1 tablet

Servings per Container 100

Amount per Serving


500 mg


157 mg

Other ingredients: dibasic calcium phosphate, sorbitol, stearic acid, colloidal dioxide, magnesium stearate, modified cellulose gum.

FREE OF: sugar, yeast, wheat, gluten, corn, soy, dairy; artificial colour, sweeteners, flavours and preservatives.

Dosage and Use
  • Suggested daily intake is 500 to 1000 mg in the morning or afternoon.
  • More may be necessary for depression or pain.
  • These products are best utilised 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 types of cancer, such as melanoma, depend on these amino acids to fuel their growth.

Supplemental use of L-phenylalanine and L-tyrosine may raise or normalise blood pressure. Insomnia may occur from over-stimulation if taken too close to bedtime. Individuals with the rare metabolic disorder phenylketonuria should avoid phenylalanine. Those suffering from migraine headaches should also avoid L-phenylalanine and L-tyrosine, because they form tyramine, a substance that may trigger migraines.


  • Keep out of reach of children.
  • Do not exceed recommended dose.
  • Do not purchase if outer seal is broken or damaged.
  • If you are undergoing treatment for a medical condition or if you are pregnant or lactating, please consult your medical practitioner first.

This product was added to our catalogue on June 19, 2013.

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Product reviews are provided for informational purposes only and reflect solely the views and opinions expressed by the contributors and not those of Life Extension. We do not verify or endorse any claims made in these reviews.