Supplement · amino_acid
Tyrosine
Quick read: L-Tyrosine is a non-essential aromatic amino acid, a fundamental building block for proteins and a crucial precursor to several vital neurochemicals and hormones.
Quick facts · L-Tyrosine
- Dose
- 500 mg
- Per day
- 1500 mg
- Timing
- First half of the day · Between meals · 3 times a day
- Course
- 60 days + break 30 days
- Strongest effect
- Dopamine System SupportHighTheoretical
Scientific background
Form & dosage
- Single dose
- 500 mg
- Daily
- 1500 mg
- Course
- 60 days
- Break
- 30 days
- Timing
- First half of the day · Between meals · 3 times a day
- Single dose
- 750 mg
- Daily
- 2250 mg
- Course
- 60 days
- Break
- 30 days
- Timing
- First half of the day · Between meals · 3 times a day
How we rate evidence
Probability — how likely the effect is to show up
- Very high
- High
- Medium
- Low
Evidence — where the data comes from
- Scientific Meta-analyses and randomized trials
- Clinical Clinical trials and practice
- Animal research Animal studies
- People reports User reports and anecdotes
- Theoretical Mechanistic reasoning, not yet tested
Effects
High probability(1)
- Dopamine System Supportpsychetheoretical
As the fundamental precursor to dopamine, Tyrosine directly supports the synthesis and maintenance of this crucial neurotransmitter, which plays a central role in motivation, reward, and executive functions within the brain.
Medium probability(6)
- Fatigue Reductionpsycheclinical
Tyrosine plays a role in replenishing catecholamine levels, which can become depleted during prolonged stress or wakefulness. This support helps to combat feelings of mental and physical fatigue, leading to increased alertness and stamina.
- Mood Improvementpsychepeople_reports
By influencing dopamine pathways, Tyrosine can subtly elevate mood and reduce feelings of apathy, contributing to a more positive outlook. Its effects are often most noticeable when mood is dampened by stress or lack of motivation.
- Motivation Increasemindclinical
Tyrosine serves as a direct precursor to dopamine, a key neurotransmitter for motivation and reward. Supplementing it can enhance your internal drive, making it easier to initiate tasks and pursue goals, particularly when faced with mental inertia.
- Brain Fog Reductionmindpeople_reports
Through its role in optimizing neurotransmitter levels, Tyrosine can help clear mental 'fogginess', leading to enhanced mental clarity, quicker thought processing, and an improved ability to articulate ideas. Many users report a sharper, more alert mind.
- Stress Resilience Improvementpsycheclinical
Tyrosine supplies the building blocks for vital neurotransmitters like norepinephrine and dopamine, which are critical for stress adaptation. It helps your brain maintain cognitive function and emotional balance when facing acute psychological or physical pressure, though individual responses can vary.
- Concentration Improvementmindclinical
By supporting the synthesis of dopamine and norepinephrine, Tyrosine can enhance your ability to focus and sustain attention, especially during periods of high demand or fatigue. While many users report clearer thinking, some may find the effect subtle.
Low probability(1)
- Thyroid Health Supporthealththeoretical
Tyrosine is a key amino acid required for the synthesis of thyroid hormones (T3 and T4). While direct supplementation for thyroid health may be limited unless a specific deficiency exists, it offers foundational support for the gland's normal function.
Side effects
Medium probability(1)
- Nauseahealthpeople_reports
Some users report an upset stomach or feeling of nausea, especially when taking tyrosine on an empty stomach or at higher doses. This is usually a mild, temporary discomfort as your digestive system adjusts.
Low probability(7)
- Insomniapsychepeople_reports
Due to its stimulating properties, taking tyrosine too late in the day can interfere with sleep, making it difficult to fall or stay asleep for some users.
- Nervousness and Restlessnesspsychepeople_reports
Some individuals may experience a feeling of nervousness or jitteriness, particularly with higher doses, as tyrosine boosts catecholamine levels which can increase arousal.
- Increased Anxietypsychepeople_reports
For a small percentage of users, particularly those prone to anxiety or taking higher doses, tyrosine's role in increasing stimulating neurotransmitters like norepinephrine can exacerbate anxious feelings.
- Diarrheahealthpeople_reports
Loose stools or diarrhea can occur, often linked to higher dosages or individual sensitivity to amino acid supplements impacting gut motility.
- Headachehealthpeople_reports
Headaches can occur, particularly when first starting tyrosine or if the dose is too high. This might be due to its effects on neurotransmitter levels in sensitive individuals.
- Irritabilitypsychepeople_reports
In some cases, especially at higher intake levels, the increased stimulant effect from tyrosine can lead to heightened irritability or a shorter temper.
- Digestive Discomforthealthpeople_reports
General digestive discomfort, including feelings of fullness, stomach upset, or mild cramps, can occur as your body processes the supplement, particularly if not taken with meals.
Low probability(4)
- Tachycardiahealthpeople_reports
While rare in healthy individuals, sensitive users or those taking very high doses might experience a temporary increase in heart rate due to tyrosine's influence on catecholamine production.
- Increased Blood Pressure (Hypertension)healthpeople_reports
Tyrosine is a precursor to norepinephrine and epinephrine, which can increase blood pressure. While usually mild, individuals with pre-existing hypertension or those taking high doses should monitor for this effect.
- Heartburn / Refluxhealthpeople_reports
A burning sensation behind the breastbone can sometimes be reported, especially if tyrosine is taken without food or if you are prone to acid reflux.
- Dizzinessmindpeople_reports
A feeling of lightheadedness or dizziness may occur, particularly if blood pressure fluctuates or if the stimulating effects are too pronounced for an individual.