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Amino acid

L-Tyrosine

L-tyrosine is an amino acid the body makes from phenylalanine. It is the starting material for dopamine, noradrenaline and thyroid hormones.

Also listed as n-Acetyl-l-tyrosine, NALT, acetyl-l-tyrosine, N-Acetyl L-Tyrosine

CognitionStress & MoodOrgan Function

The strongest lead is a demanding situation

A review found the most promising cognitive results during short-term stress or demanding tasks. A separate rapid evidence assessment judged the evidence too limited for a confident recommendation. These findings support a focused research question rather than a promise of more mental energy throughout an ordinary day. 1 2

Mental EnergyMixed

Potential benefits appear dependent on the task and stress conditions, with limited confidence overall. 1 2

A benefit on one task is not an all-purpose boost

In a study of 20 adults, tyrosine improved working-memory accuracy, the ability to hold information briefly while using it, during multitasking. It did not improve the arithmetic, visual or auditory tasks, or performance under the simpler task condition. That distinction matters when a supplement is advertised as helping every aspect of focus. 3

Focus And AttentionMixed

One small experiment found a selective working-memory benefit under multitasking conditions. 3

Effects by health goal

Open an effect to see the studies behind its rating. Bars show the size of the effect; the letter grades the evidence.

Organ Function1 effect

Thyroid HealthOrgan FunctionNo effectFNo linked study

No study is linked to this rating.

Rated by SuppCo · medium confidenceEvidence record

All studies

9 publications are linked to L-Tyrosine, newest first.

Food for Your Mind? The Effect of Tyrosine on Selective Attention2019Effects of acute caffeine, theanine and tyrosine supplementation on mental and physical performance in athletes2019Behavioral and cognitive effects of tyrosine intake in healthy human adults2015Effect of tyrosine supplementation on clinical and healthy populations under stress or cognitive demands--A review.2015Food for creativity: tyrosine promotes deep thinking2014The effects of tyrosine depletion in normal healthy volunteers: implications for unipolar depression2004Tyrosine Improves Working Memory in a Multitasking Environment1999L-Tyrosine to alleviate the effects of stress?Tyrosine for Mitigating Stress and Enhancing Performance in Healthy Adult Humans, a Rapid Evidence Assessment of the Literature

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