L-Tyrosine is an amino acid found in the diet that’s involved with generating catecholamines like dopamine and adrenaline is the amino acid which itself is metabolized to create these neurotransmitters. It’s investigated as a nutritional supplement based on the idea that supplementing L-tyrosine will provide more building blocks for these catecholamines to be generated and hopefully, indirectly, supply benefits secondary to them. As it’s structurally associated with thyroid hormones significance that, due to the relationships with both adrenaline and thyroid, it’s commonly found on some level.

With regards to the theme of effectively increasing dopamine and adrenaline outright, L-tyrosine doesn’t seem to hold much promise. The synthesis of catecholamines is very controlled in the human body and particularly the one enzyme which converts L-tyrosine in the following metabolite, L-DOPA, so only increases the amount of L tyrosine on your body doesn’t increase catecholamine production. Yet some research has noted that in trying situation in which catecholamine called norepinephrine, has a protective effect throughout the stress, supplying a few L-tyrosine appears to provide a safety pad for building blocks which may prolong the anti-stress impact of catecholamines by delaying their depletion.

This was noted in situations of cold stress and difficulty in sleeping in humans but in a relatively higher dose of 150mg/kg. L-tyrosine might be useful in situations where catecholamines might be depleted simply by supplying more material to make fresh catecholamines from. But, it does not appear to hold much promise at this stage of time to get unilaterally increasing them.

Recommended dosage, active quantities, other details

Anecdotally, L-Tyrosine tends to be taken in doses of approximately 30-sixty minutes before any severe stressor. Studies in humans showing most anti-stress promise for acute supplemental L-Tyrosine utilize a dosage range of 100-150mg/kg bodyweight which might be taken sixty minutes before exercise, this really is a dosage range of 9-13.5gram for a 200lb person and 7-10g to get a 150lb person.

If using higher doses and discovering digestion issues, this can be divided into two doses separated by 30 minutes.



Individuals with PKU aren’t able to process the amino acid phenylalanine, which is utilized by the body to make tyrosine. Due to this, people with PKU may have a low level of tyrosine within the body. Individuals with PKU are advised to consume 6 g of tyrosine per 100 g of proteins to improve tyrosine levels within the body.

Mental performance

Some early studies suggest that taking two hours before testing doesn’t improve speed or mood of reaction to visual or noise stimuli in a healthy men and women. Several types of research show that tyrosine improves mental performance under stressful conditions, like military training stress, or noise induces stress.


Some research indicates that taking 2 hours before testing doesn’t improve memory in healthy men and women. Many types of research show that tyrosine improves memory under conditions, like pressure or multitasking. Improving alertness following the reduction of sleep. Taking 150 mg/kg of tyrosine appears to help individuals who’ve lost a night’s sleep remain alert for around 3 hours longer than they otherwise would. Additionally, early research indicates that tyrosine improves memory and reasoning in individuals that are sleep deprived.

Attention deficit disorder

Taking tyrosine by mouth doesn’t seem to improve signs of adult ADD. Attention deficit hyperactivity disorder. Taking tyrosine by mouth doesn’t seem to improve signs of childhood ADHD.


Taking the tyrosine by mouth is not appear to improve symptoms of mild depression.

Exercise functionality

Taking tyrosine before participating in a treadmill machine walking with a load carriage doesn’t seem to improve endurance or strength. Taking tyrosine, alone or with polydextrose 70, doesn’t appear to improve the heart rate or functionality in a cycling test.


Early research indicates that taking a combination of L, D phenylalanine, L-tyrosine, L-glutamine, and L-tryptophan together with a multivitamin may help reduce signs of withdrawal and decrease stress.

Cocaine Dependence

Early research indicates that taking L-tyrosine in the morning and L-tryptophan at nighttime doesn’t reduce drug cravings or withdrawal symptoms in individuals with cocaine dependence.


Early research indicates that taking a combination of tyrosine, 5-hydroxytryptophan, and carbidopa by mouth doesn’t improve symptoms in People With Severe Dementia Due to Alzheimer’s disease or multi-infarct dementia.

High blood pressure

Early research indicates that carrying tyrosine by mouth does not have an effect on blood pressure level in patients with marginally high blood pressure.

Excessive sleepiness

Research indicates that carrying tyrosine by mouth may reduce some signs of narcolepsy, like emotions of fatigue, based on patient evaluations. But, it doesn’t seem to improve most signs of narcolepsy based on clinical evaluation.


Early research indicates that taking L-tyrosine with the medication molindone for 3 months doesn’t improve signs of schizophrenia better compared to molindone alone.

Weight reduction

Taking a combination of tyrosine, cayenne pepper, green tea, caffeine, and calcium for 8 months seems to marginally reduce body fat mass by 0.9 kg in obese men and women. On the other hand, the combination supplement doesn’t seem to improve blood pressure level, heart rate, or the excretion of fat from the stool.

Wrinkled skin

A topical preparation containing ten percent vitamin C as L ascorbic acid tyrosine, zinc sulfate, sodium hyaluronate, and bioflavonoids Employed for 3 months to facial skin aged by sun seems to increase fine and coarse wrinkling, yellowing, roughness, and skin tone.


Premenstrual syndrome

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Heart disease

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