The benefits of L-Tyrosine Ethyl Ester:  Amino Acid Esters are amino acids with an ester molecule attached. Esters are organic compounds that are formed by esterification, which is the reaction of carboxylic acid and alcohols. Esters are organic compounds that help shuttle the amino acid across lipid membranes of the gut and directly into the bloodstream for direct transport to your cells. This prevents the amino acid from being destroyed in the gut and drives more of the free form amino acid directly into muscle tissue where it can be more efficiently used for its intended purpose.

Free form amino acids have inherent limitations such as limited absorption through the intestine. Whereas amino acid esters can pass through the intestine largely intact, regular free form aminos can be significantly degraded in the intestine, leaving only trace amounts of the ingested dose active. Because of the rapid breakdown of some amino acids in the intestine, its beneficial effects can be limited. Ethyl ester amino acids are thought to have a much better absorption rate and a longer half-life in the body than regular free from amino acids because it is slightly more lipophilic.

Amino acids

Suggested Usage:  As a dietary supplement, take 1–2 capsules daily, or up to 1 g of powder, on an empty stomach immediately after arising in the morning, preferably with juice as a carbohydrate source, or as directed by your qualified health consultant.

Hypoallergenic: Contains no yeast, dairy, egg, gluten, corn, soy, wheat, sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.

Warning: NOT INTENDED FOR USE BY PERSONS UNDER THE AGE OF 18. KEEP OUT OF THE REACH OF CHILDREN. If you are pregnant or breast feeding, consult your health care professional before using this product. People with known medical conditions and/or taking drugs should consult with a licensed physician and/or pharmacist prior to taking any dietary supplements. Do not take in conjunction with MAO inhibitor drugs. Not for use by persons with a history of malignant melanoma or if bipolar, pregnant, suspect pregnancy, or lactating. Tyrosine should not be taken by those with conditions associated with increased dopamine levels such as mania and schizophrenia. This supplement may increase sensitivity to the effects of CNS stimulants. Caution is advised when taking tyrosine along with stimulants and dosages should be lowered accordingly. Keep out of the reach of children.

L-Tyrosine side effects: L-Tyrosine may help some people in their fight against depression, but dosages above 500 mg, in some people, may cause anxiety, restlessness and rapid heart rate. L Tyrosine can cause over stimulation, restlessness, anxiety, and insomnia. Heart palpitations or arrhythmias are potential side effects that occur from high doses of tyrosine. These can occur in sensitive individuals in as low a dose as 200 to 500 mg. Always start with a low dose, such as 200 mg or less, even if it means opening a tyrosine capsule and taking a portion of it.

Quality & Purity since 1996:   Since 1996, NutraBio has manufactured the purest pharmaceutical grade products available. Each batch is laboratory tested to be at least 99.9% pure or we won't ship it to you. We manufacture in the United States to meet FDA 21 CFR Part 111 c-GMP regulations and all ingredients undergo state-of-the-art analysis to insure zero tolerance for impurities. We ship our products direct to you to guaranty the freshness.

• Manufactured by us in our GMP facility.
• HPLC laboratory tested for purity.
• Freshly manufactured - never expired or closeout products.
• Backed by the NutraBio 30-Day money back guarantee.

No excipients or fillers: Our goal is to manufacture our supplements as pure as possible, so we don't use fillers, binders, or chemical excipients. Other manufacturers, in an effort to keep costs down, dilute their products with cheap fillers and excipients, which cheats you out of the active ingredient and contaminates your product with unneeded chemicals. At NutraBio, we keep our products clean and only use excipients when absolutely necessary. Purity is our #1 goal.

Purchase manufacturer direct at wholesale price:  Buy directly from the manufacturer and save. We cut out the middlemen and pass the savings on to you. With NutraBio, you pay the same low wholesale price that the chain stores pay. Did you know that most companies do not manufacture their products but use 3rd party manufacturers. Since we manufacture all of our own products we can control the quality and purity through the entire manufacturing process.

FREE dosing scoop with your powder order: Get the exact dosage every time with a free single-dose scoop. This scoop was designed by our lab to give you exactly one serving each time. No more measuring or guessing.

[1] Tyrosine (and N-Acetyl-L-Tyrosine) [PDF, 232KB] Reform Magazine online John M. Berardi
[2] Hair pigmentation: a research update. J Investig Dermatol Symp Proc. 2005 Dec;10(3):275-9 Tobin DJ, Hordinsky M, Bernard BA
[3] The actions of melanin and melanocyte stimulating hormone (MSH) Neuroendocrinology Letters 1999; 20:265–282 Natalie Rasmussen, Francine Nelson, Piyarat Govitrapong, Manuchair Ebadi
[4] Melanin [monograph] Wikipedia online encyclopedia
[5] Tyrosine [monograph] Wikipedia online encyclopedia
[6] Dopaminergic deficit and mood disorders. Int Clin Psychopharmacol. 2002 Dec;17 Suppl 4:S1-7; discussion S7 Pania L, Gessab GL
[7] Chronic mild stress (CMS) revisited: consistency and behavioural-neurobiological concordance in the effects of CMS. Neuropsychobiology. 2005;52(2):90-110. Epub 2005 Jul 19 Willner P
[8] [L-tyrosine cures, immediate and long term, dopamine-dependent depressions. Clinical and polygraphic studies][Article in French] C R Acad Sci III. 1988;306(3):93-8 Mouret J, Lemoine P, Minuit MP, Robelin N
[9] Tyrosine for the treatment of depression. Nutr Health. 1984;3(3):163-73 Gelenberg AJ, Gibson CJ
[10] Tyrosine improves cognitive performance and reduces blood pressure in cadets after one week of a combat training course. Brain Res Bull. 1999 Jan 15;48(2):203-9 Deijen JB, Wientjes CJ, Vullinghs HF, Cloin PA, Langefeld JJ.
[11] Cats require more dietary phenylalanine or tyrosine for melanin deposition in hair than for maximal growth. J Nutr. 2002 Jul;132(7):2037-42 Anderson PJ, Rogers QR, Morris JG
[12] Vitiligo therapy with oral and topical phenylalanine with UVA exposure. Int J Dermatol. 1989 Oct;28(8):545-7 Antoniou C, Schulpis H, Michas T, Katsambas A, Frajis N, Tsagaraki S, Stratigos J
[13] Evidence for antioxidant nutrients-induced pigmentation in skin: results of a clinical trial. Biochem Mol Biol Int. 1997 Aug;42(5):1023-33 Postaire E, Jungmann H, Bejot M, Heinrich U, Tronnier H
[14] Stimulation of mouse melanocyte proliferation by Piper nigrum fruit extract and its main alkaloid, piperine. Planta Med 1999 Oct;65(7):600-3 Lin Z, Hoult JR, Bennett DC, Raman A
[15] Chronic dietary tyrosine supplements do not affect mild essential hypertension. Hypertension. 1985 Jul-Aug;7(4):593-6 Sole MJ, Benedict CR, Myers MG, Leenen FH, Anderson GH
[16] [L-tyrosine: a long term treatment of Parkinson's disease][Article in French] C R Acad Sci III. 1989;309(2):43-7 Lemoine P, Robelin N, Sebert P, Mouret J