Ingredient
Limited evidenceL-Tyrosine
Also known as: tyrosine, N-acetyl-L-tyrosine
An amino acid for focus under stress — most useful when you are fatigued or pushed hard.
What it is
L-tyrosine is an amino acid the body uses to make dopamine, adrenaline and noradrenaline, the chemicals behind alertness and focus. It is a common ingredient in pre-workouts and nootropic blends, marketed for sharper mental performance.
How it works
Under demanding conditions, such as stress, sleep deprivation or intense effort, your brain can deplete these neurotransmitters. Tyrosine provides the raw material to top them back up, which is why the evidence is strongest for maintaining focus under stress or fatigue rather than boosting a well-rested mind in normal conditions.
Effective dose
Studied doses range widely, commonly 500 to 2000mg taken 30 to 60 minutes before a demanding task or workout. N-acetyl-L-tyrosine (NALT) is a more soluble form but is less well absorbed gram-for-gram, so plain L-tyrosine is often the better value.
Safety and upper limit
L-tyrosine is well tolerated at typical doses. People taking thyroid medication or MAOI antidepressants, or who have certain conditions, should check with a clinician, as tyrosine feeds into thyroid hormone and catecholamine pathways.
Where you find it
Pre-workouts, focus and nootropic blends, some fat-burners.
Top Pre-Workout picks
The highest-scoring products in the category where L-Tyrosine matters most.
Frequently asked
How much L-tyrosine should I take?
Commonly 500 to 2000mg, taken 30 to 60 minutes before a workout or demanding task.
Does L-tyrosine actually improve focus?
The evidence is strongest for maintaining focus under stress, fatigue or sleep deprivation, and weaker for boosting a well-rested mind in normal conditions.
Is NALT better than L-tyrosine?
N-acetyl-L-tyrosine is more soluble but absorbed less efficiently gram-for-gram, so plain L-tyrosine is often the better-value choice.
L-Tyrosine vs ...
Related guides
This page is educational and not medical advice. Doses are general guidance from the published research, not a personal prescription. Before starting any supplement that could affect a medical condition or interact with medication, speak to a qualified clinician.