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Doctor insights on: L Tyrosine L Phenylalanine Autism

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Dr. Johanna Fricke
623 doctors shared insights

Autism (Definition)

Autism is a neurodevelopmental disorder affecting three areas: abnormal socialization, communication, and restricted interests with repetitive patterns of behavior. It is usually detected in the first two years of life. Cause is unknown but strong evidence points to an interplay between genetic and environmental factors. Patients with autism may display significant delays in certain developmental areas while having normal or superior strengths in other developmental or learning domains. The severity of the disorder is highly variable ...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 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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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

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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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What is the recommended daily dosage of l-tyrosine?

There is none: Tyrosine is a precursor of ldopa which make dopamine. It should only be used as part of a balanced program to resort the neurotransmitters and should be guided by a knowlegable doctor who manages patients with neurotransmitter problems. ...Read more

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Is 5-htp and l-tyrosine the same or different?

Is 5-htp and l-tyrosine the same or different?

Different: 5htp is a precursor of serotonin, an inhibitory neurotransmitter. L-tyrosine is a precursor of the dopaminergic neurotransmitters Epinephrine and norepinephrine, which are stimulatory neurotransmitters. Although both 5htp and l-tyrosine may act as anti-depressants, they act in completely different ways. 5htp is best taken at bedtime; l-tyrosine should be taken in the am or during the day. ...Read more

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Is it okay to take 5-htp and l-tyrosine together?

No: 5htp is an inhibitory neurotransmitter precursor, and l_tyrosine is a stimulatory neurotransmitter precursor. Taking them together will probably counteract any benefit that you are seeking from either one. ...Read more

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Is 5-htp and l-tyrosine the same thing or different?

Different: These are Amino Acids that the body uises in ver specific ways. Unbalanced use of these Amino Acid have the ability to do far more harm than good. They really should only be managed by physicians who are fully aware of how to use them properly. ...Read more

Dr. Johanna Fricke
516 doctors shared insights

Autism Spectrum Disorder (Definition)

Autism spectrum disorder, also called pervasive developmental disorder (PDD), is a type of condition that includes life-long impairment in the ability to communicate and to have normal social interactions. These include ...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