What Is L-Tyrosine?
L-tyrosine is an essential amino acid that is a precursor to three key neurotransmitters: dopamine, norepinephrine and adrenaline. These neurotransmitters regulate motivation, focus, alertness and the stress response. Under intense physical or psychological stress, catecholamine stores in the brain become depleted — L-tyrosine helps replenish them.
🧪 What the Science Says
😴 Sleep Deprivation Correction
A study with military personnel: 150 mg/kg L-tyrosine (about 10 g for a 70 kg person) after 24 hours without sleep improved cognitive function for 3 hours.
🧠 Concentration and Memory
L-tyrosine (2 g) improved working memory and cognitive flexibility under stressful conditions. In a calm environment the effect is insignificant (Deijen &).
🏋️ Sports Performance
L-tyrosine (150 mg/kg) 90 min before training in heat increased endurance. It reduced perceived fatigue and improved focus.
🧪 Dopamine Synthesis
L-tyrosine is converted to L-DOPA, and this to dopamine. The process depends on the enzyme tyrosine hydroxylase, which is the rate-limiting step.
📋 Dosage Recommendations
- Standard Dose: 1-2 g 30-60 min before a stressful situation or training
- For sleep deprivation correction: 5-10 g (in extreme cases)
- For mood / motivation: 500-1000 mg in the morning on an empty stomach
- Important: Take on an empty stomach — other amino acids compete for absorption
- Do not exceed: 12 g per day (may cause headache)
🛒 Recommended Products
❓ Frequently Asked Questions
How Does Tyrosine Differ from L-Theanine?
L-theanine calms and improves focus through GABA/serotonin systems ("calm energy"). Tyrosine stimulates through dopamine/norepinephrine systems ("active energy"). Both can be used together for different purposes.
Does Tyrosine Cause Dependence?
No. L-tyrosine is a food component, and the body strictly regulates its conversion to neurotransmitters via the enzyme tyrosine hydroxylase. This means you cannot "overdose" dopamine through tyrosine.