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L-Tyrosine is an amino acid (building block of protein) that is “conditionally essential,” as generally it must be supplied by the diet, although it can be produced from the essential amino acid L-Phenylalanine (a process dependent upon vitamin B-6). (L-tyrosine is essential for individuals with phenoketonuria, who cannot produce L-tyrosine from L-Phenylalanine.) L-Tyrosine is the precursor to the thyroid hormones, as well the catecholamines, dopamine, norepinephrine and epinephrine. As such, deficiency can have far-reaching affects on metabolic rate and neural regulation of the sympathetic nervous system1, 6, 7, including central effects on mood and memory3, 5. In particular, supplementing with L-tyrosine may enhance arousal and therefore performance during high intensity exercise, such as weight training 4. During a fat-loss regimen that includes thermogenic supplements such as ephedrine or green tea extract, L-tyrosine may enhance the anorectic (appetite suppressing) actions of these supplements2.
Supplement Use:
L-tyrosine (5-10g / day) can be used to enhance cognitive performance during times of stress, high-intensity and possibly endurance exercise. L-tyrosine can be taken to ensure optimal thyroid function when attempting to lose body fat with diet and exercise, as well as enhance the appetite-suppressant effects of thermogenics. L-tyrosine might also be combined with with DL-Phenylalanine to treat depression. Individuals with phenylketonurics should refer to their physician if attempting to use this supplement.
Ingredients: L-Tyrosine.
Directions: As a dietary supplement, take 5g of material 1-2 times daily.
Warnings: If you are currently pregnant or nursing, consult a physician prior to use. Keep out of the reach of children.
Allergen Warnings: This product is free from all forms of shell fish, tree nuts, yeast, gluten, salt, preservatives, artificial ingredients, lactose, and soy. This product is manufactured in a facility that handles soy, gluten, and milk products.
Packaging: This product is packaged in a plastic container with an interior pressure-sensitive lining to ensure product integrity.
Vegan or Vegetarian Safe: This material is synthetically derived, but can often originate from animal byproducts.
Shelf Life: This product will retain a 2 year shelf life from the date of manufacturer if properly sealed and stored in a dry, cool environment outside of direct sunlight.
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1. Elkin, R. G., W. R. Featherston, and J. C. Rogler. Effects of dietary phenylalanine and tyrosine on circulating thyroid hormone levels and growth in the chick. J Nutr . 110:132-138, 1980.
2. Hull, K. M. and T. J. Maher. L-tyrosine fails to potentiate several peripheral actions of the sympathomimetics. Pharmacol Biochem Behav . 39:755-759, 1991.
3. McTavish, S. F., Z. N. Mannie, C. J. Harmer, and P. J. Cowen. Lack of effect of tyrosine depletion on mood in recovered depressed women. Neuropsychopharmacology . 30:786-791, 2005.
4. Meeusen, R., P. Watson, and J. Dvorak. The brain and fatigue: new opportunities for nutritional interventions? J Sports Sci . 24:773-782, 2006.
5. Roiser, J. P., A. McLean, A. D. Ogilvie, A. D. Blackwell, D. J. Bamber, I. Goodyer, P. B. Jones, and B. J. Sahakian. The subjective and cognitive effects of acute phenylalanine and tyrosine depletion in patients recovered from depression. Neuropsychopharmacology . 30:775-785, 2005.
6. Schweiger, U., M. Warnhoff, and K. M. Pirke. Brain tyrosine availability and the depression of central nervous norepinephrine turnover in acute and chronic starvation in adult male rats. Brain Res . 335:207-212, 1985.
7. Tahara, Y., M. Hirota, K. Shima, S. Kozu, H. Ikegami, A. Tanaka, Y. Kumahara, N. Amino, S. Hayashizaki, and K. Miyai. Primary hypothyroidism in an adult patient with protein-calorie malnutrition: a study of its mechanism and the effect of amino acid deficiency. Metabolism . 37:9-14, 1988.
***Packaged in pharmaceutical grade plastic jug/jars sealed with screw caps***
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