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Doctor insights on: Phenylalanine And Tyrosine

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What is the pathway and role of vitamin B12 in metabolism/catabolism of phenylalanine and tyrosine? Thank you.

What is the pathway and role of vitamin B12 in metabolism/catabolism of phenylalanine and tyrosine? Thank you.

Nothing: In the normal child less than 50% of dietary phenylalanine is utilized for polypeptide ; protein synthesis. Most of that remaining is converted to tyrosine. All this takes place by enzymatic chemical activity and I am not aware that vitamin b-12 is involved. ...Read more

Dr. Lobelia Samavati
735 doctors shared insights

Tyrosine (Definition)

Tyrosine is an amino acids. Thyrosine and other Amino Acids are joined together to make proteins. Most proteins have ...Read more


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What is the pathway and role of vitamin B12 in metabolism/catabolism of phenylalanine and tyrosine? Thank you.

Nothing: In the normal child less than 50% of dietary phenylalanine is utilized for polypeptide ; protein synthesis. Most of that remaining is converted to tyrosine. All this takes place by enzymatic chemical activity and I am not aware that vitamin b-12 is involved. ...Read more

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What is the role of methionine in catabolism of phenylalanine and/or tyrosine? Can you please post any link about those two amino acids? Thank you

What is the role of methionine in catabolism of phenylalanine and/or tyrosine? Can you please post any link about those two amino acids? Thank you

Methylation: When homocyateine is elevated there is problem with methylation. Methioneine, methyl folate, (folic acid) methyl cobalamine, and magnesium may all be helpful. Low blood pressure occurs with a histamine reaction. Vitamin c and bioflavanoids, copper avoidance and understanding histamine intolerance (google it) will help. Alcohol avoidance, frequent healthy meals, stress reduction, and frequent movement helps. ...Read more

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Are tyrosine supp. Helpful to replenish dopamine after Adderall (dextroamphetamine and racemic amphetamine) use on days i don't eat enough protein (dietary sources of tyrosine/phenylalanine)?

Are tyrosine supp. Helpful to replenish dopamine after Adderall (dextroamphetamine and racemic amphetamine) use on days i don't eat enough protein (dietary sources of tyrosine/phenylalanine)?

No. : Trouble with protein supps is we are hoping the body converts them the way we need them to be. Also very few things cross the blood-brain barrier when doping is created so it is doubtful that that tyrosine supps will either. ...Read more

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I want to boost dopamine level .So what's the difference among the three supplement : L Tyrosine , L-Dopa (Mucuna) and L-Phenylalanine?

I want to boost dopamine level .So what's the difference among the three supplement : L Tyrosine , L-Dopa (Mucuna) and  L-Phenylalanine?

Amino acids: These are different amino acids your body can use to make other amino acids. Most people want to boost their dopamine level in the brain, it is not clear that taking supplements can do this. What is you goal, actually? It would be better to start there. ...Read more

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What foods are highest in tyrosine?

What foods are highest in tyrosine?

Precursor for neuro: Tyrosine is an Amino Acid precursor of two neurotransmitters, norepinephrine and dopamine. Some patients take it to increase their energy, alertness, and improve their mood. However, it can raise blood pressure. It is found in dairy, soy, meats, fruits and vegetables, nuts, seeds, beans, and grains. I believe it is highest in seaweed and soy protein. ...Read more

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Can l-tyrosine help add?

Somewhat: Swedish medical center found some benefit for add with tyrosine, but the benefits lasted only a couple weeks. Also advised using acetyl-l-tyrosine instead of l-tyrosine due to fewer negative side effects & lower dose used. Discuss any supplements with fp before taking them to make sure there are no serious drug interactions with your other meds. ...Read more

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Is soy a good a source of a tyrosine?

Is soy a good a source of a tyrosine?

Hi Odds No! Why?: There is lots of marketing about ?$ to produce processed plant stuff. Yet we are not plants; we are animals, with lots of cholesterol as a building block of every cell membrane, have bodies evolved from living as hunter/gathers who can be sold lots of confusing nonsense. Look up "soy tyrosine" on Google, e.g. the mercola.com article & Study: http://goo.gl/foDTU0, http://goo.gl/e2lDwm, my answers ...Read more

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Where can I buy a phenylalanine-free milk?

Where can I buy a phenylalanine-free milk?

Milk: U don't specify the age of the person needing this product. Following site discusses 3 products (depending on age): http://www.Kibid.Rs/en/milupa/pku-products here is website where pku-3 (for over 15 y/o) is available: http://www.Allegromedical.Com/dietary-supplements-c522/pku-3-p559305.Html [not inexpensive}. ...Read more

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Is l-tyrosine safe to take for young adults?

Not Necessarily: Outside of ordinary amounts in diet, supplements of this Amino Acid may be dangerous regarding blood pressure , haert and neurological health. Never proven to help anything. ...Read more

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Is tyrosine and tyrosinase one and the same?

No: Tyrosine is an amino acid, part of the makeup of proteins, tyrosinase is the enzyme that breaks down tyrosine into its components. ...Read more

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Can I take Tyrosine with SSSI's (Citalopran)?

Why do you want to?: Phenylalanine (Phe) is used to make tyrosine (Tyr). Tyr is used to make DOPA which is made into dopamine in neurons. Tyr that doesn't go into proteins or to make DOPA is burned for energy. If you INGEST Tyr, you just need LESS Phe, so excess Phe is burned or broken down & excreted. Unless you have some major dietary, GI or metabolic problem, you may just be wasting your $. Ask your doctor. ...Read more

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Is n-acetyl l-tyrosine the same as l-tyrosine?

Yes: Same thing; just a more detailed chemical description of the molecule. Tyrosine is one of the amino acids, which are the building blocks of protein. ...Read more

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How long will it take to effects of l-tyrosine?

How long will it take to effects of l-tyrosine?

Unknown: Assuming it has any effect on adhd, which is not established, it could take weeks or months to have any notable effect, since you are trying to build up brain supplies in the right areas high enough to overcome a presumed deficit in Dopamine or norepinephrine. My professional opinion is that it is highly unlikely one would get a marked effect, ever. ...Read more

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What level of phenylalanine is in diet snapple?

What level of phenylalanine is in diet snapple?

Ask: You may have to ask the manufacturer directly. Contact information is usually on the product label. ...Read more

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Is there any bad side effects if I use tyrosine?

Is there any bad side effects if I use tyrosine?

Everything has some : Tyrosine se include overstimulation, restlessness, anxiety, and insomnia; at higher doses, it can cause heart palpitations. The se appear to be dose related and almost certainly are reversible if you lower the dose or stop the using it. ...Read more

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How long does l-tyrosine take before it kicks in?

How long does l-tyrosine take before it kicks in?

L- thyroxine?: If the dose of thyroid hormone replacement is adequate, it usually takes 4-6 weeks in adults for medication to achieve steady levels. Sometimes smaller dose is started and dose adjusted slowly. ...Read more