Tyrosine is a non-essential amino acid the body can make from phenylalanine. It is a precursor to catecholamine neurotransmitters and thyroid hormones.

What are the main benefits of tyrosine supplements?

Tyrosine is commonly used to help maintain cognitive performance during acute stress, sleep loss, or demanding tasks. It supports the synthesis of dopamine and norepinephrine.

How much tyrosine should I take?

Common supplemental amounts are about 500–2,000 mg per day. Individual needs vary, so follow product directions and consider medical advice if you have a condition or take medications.

Does tyrosine help with mood or depression?

Tyrosine may support mood in situations where dopamine or norepinephrine activity is low, but evidence for treating depression is limited and inconsistent. It is not a replacement for professional care.

Who should be cautious with tyrosine?

People with thyroid disorders, those taking thyroid medication, MAO inhibitors, or levodopa, and individuals with phenylketonuria (PKU) should consult a clinician before use. Side effects can include nausea, headache, or restlessness in some people.

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Tyrosine

Moderate study situation·7/10

A higher score indicates better study conditions, but not necessarily effectiveness.

Tyrosine is a non-essential amino acid supplement known for supporting cognitive function under stress and as a precursor to key neurotransmitters.

Cognitive Enhancement Stress Relief Depression / Mood Enhancement Hormone Balance

dose range

500–2000 mg

divided into 2–3 doses per day

Consumption

Take on an empty stomach or away from high-protein foods to reduce competition with other amino acids for absorption.

Not fat-soluble.

Best time

Often taken in the morning or before mentally demanding tasks or exercise.

Description

Tyrosine supports the synthesis of dopamine, norepinephrine, and thyroid hormones. It is commonly taken to help maintain mental performance under stressful conditions or physical strain.

benefits

Main effects with level of evidence

Moderate

Note on evidence

Evidence is strongest for cognitive performance support under acute stress, while benefits for mood and thyroid health are less established and context-dependent.

Supports Cognitive Performance Under Stress

Moderate

Tyrosine supplementation may improve cognitive function, memory, and mental performance during periods of acute stress or fatigue by replenishing catecholamine neurotransmitters.

Particularly relevant for: People under high stress · Students · Military personnel · Athletes

1 · PubMed Study: Effects of L-tyrosine on Cognitive Performance During Acute Stress 6 · Examine.com: L-Tyrosine

May Support Mood, Particularly in Dopamine-Deficient States

Limited

As a precursor to dopamine, tyrosine might help support mood, especially in individuals with low dopamine activity, though evidence for depression treatment is limited and inconsistent.

Particularly relevant for: Individuals with low mood · People with dopamine-related mood imbalances

2 · PubMed: Tyrosine for Depression Review 6 · Examine.com: L-Tyrosine

Supports Thyroid Hormone Synthesis (in PKU or Low Intake)

Limited

Tyrosine is a building block for thyroid hormones, and may support thyroid function in certain metabolic conditions or when phenylalanine conversion is impaired (e.g., phenylketonuria).

Particularly relevant for: Individuals with phenylketonuria · People with mild thyroid hormone insufficiency

3 · PubMed: Tyrosine and Thyroid Hormone Metabolism 5 · NIH Office of Dietary Supplements – Amino Acids Fact Sheet

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

Tyrosine supplementation is generally well-tolerated at standard doses, but higher doses or inappropriate use in certain conditions can pose risks.

warning notices

May cause headache, nausea, heartburn, or restlessness, especially at high doses.
Potentially affects thyroid or catecholamine metabolism; contraindicated in hyperthyroidism and certain medication regimens.
Not recommended during pregnancy or breastfeeding due to limited safety data.
Avoid use in hyperthyroidism or those taking thyroid medications, as tyrosine can impact thyroid hormone levels.
Do not use with monoamine oxidase inhibitors (MAOIs) due to risk of hypertensive crisis.
Use only under supervision if taking levodopa, as tyrosine may interfere with its effectiveness.
Avoid use in phenylketonuria (PKU) unless medically indicated.
Consult a healthcare provider before use if pregnant or breastfeeding.

Known interactions with medications

MAOIs
Levodoopa

Contraindications / special precautions

Hyperthyroidism
Active use of MAOIs
Phenylketonuria (unless prescribed)

interactions

Important interactions between active ingredient ↔ supplement / medication / food

Tyrosine interacts with certain medications and may impact thyroid and catecholamine-related treatments.

Avoid tyrosine with MAOI drugs due to hypertensive crisis risk.

drug · Monoamine oxidase inhibitors (MAOIs)

AvoidStrong

Why

Tyrosine can increase tyramine levels, which in combination with MAOIs may trigger dangerous elevations in blood pressure.

recommendation

Do not use tyrosine if taking MAOIs.

4 · WebMD: L-Tyrosine – Uses, Side Effects, and More 6 · Examine.com: L-Tyrosine

Tyrosine may reduce effectiveness of levodopa in Parkinson’s disease.

drug · Levodoopa

CautionModerate

Why

Tyrosine and levodopa compete for absorption in the gut and for transport across the blood–brain barrier.

recommendation

Use only under medical supervision if taking levodopa; separate doses as advised by a healthcare provider.

4 · WebMD: L-Tyrosine – Uses, Side Effects, and More

Tyrosine may affect thyroid hormone synthesis.

nutrient · Thyroid hormone

MonitorModerate

Why

As a substrate for thyroid hormone production, supplemental tyrosine may influence thyroid function, especially in those on thyroid medication or with thyroid disorders.

recommendation

Monitor thyroid function regularly if taking thyroid medications or have thyroid disease.

3 · PubMed: Tyrosine and Thyroid Hormone Metabolism

mechanisms of action

Brief explanations of how it works

Precursor for Catecholamine Neurotransmitters

Tyrosine is converted to L-DOPA, which is then metabolized to dopamine, norepinephrine, and epinephrine, all crucial for cognitive and physiological stress responses.

1 · PubMed Study: Effects of L-tyrosine on Cognitive Performance During Acute Stress 5 · NIH Office of Dietary Supplements – Amino Acids Fact Sheet