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L-Tyrosine is a semi-essential amino acid, however essential under certain metabolic circumstances like phenylketonuria. It improves concentration, mood, and attention, reduces appetite and delays fatigue. L-Tyrosine is also required for the production of the neurotransmitters dopamine, adrenaline, and noradrenaline, as well as for the skin pigment, melanin.
L-Tyrosine, which can also be synthesized in the body from phenylalanine, is found in many high-protein food products such as chicken, turkey, fish, milk, yogurt, cottage cheese, cheese, peanuts, almonds, pumpkin seeds, sesame seeds, soy products and lima beans, but also in avocados and bananas. For example, the white of an egg has about 250 mg per egg, while lean beef/lamb/pork/salmon/chicken/turkey contains about 1g per 3 ounces (85g) portion.
L-Tyrosine is used in many rejuvenating or reenergizing supplement formulas. Tyrosine is an amino acid that is the precursor to the neurotransmitters norepinephrine and dopamine, which regulate mood. Norepinephrine also suppresses appetite and helps to reduce body fat and, with iodine, forms active thyroid hormones. Deficiency can lead to low mood (hence to poor concentration), low blood pressure and body temperature, and restless leg syndrome.
Tyrosine is also involved in the metabolism of the amino acid phenylalanine, and has been used successfully for headaches, stress reduction, anxiety, and to support individuals dealing with chemical addictions.
Follow the manufactures dosage instruction on the label. Most manufactures dosages range from 250mg to 500mg tablets. If these dosages cause any adverse effect lower the dosage or discontinue usage.
Persons taking MAO (monoamine oxidase) inhibitors for depression should not take tyrosine, because the combination may lead to sudden, dangerous rise in blood pressure. Too high a dose can cause side effects such as irritability, restlessness, anxiety, and heart rhythm problems.
Cancer patients should avoid taking L-Phenylalanine and L-Tyrosine. Certain cancers, such as melanoma, depend on these amino acids to fuel their growth.