The main benefits of L-tyrosine are related to its ability to replenish catecholamine levels in the brain, which can become depleted under stressful conditions.[1] Multiple studies have demonstrated that L-tyrosine can help to prevent declined cognitive function under stressful, cognitively demanding conditions.[2] Although it has not been shown to improve memory under resting conditions, L-tyrosine supplementation has been shown to alleviate reduced memory under acutely stressful conditions.[3] Overall L-tyrosine appears to be safe and well-tolerated at moderate doses, with one 2-week human trial using a dose of 2500 mg, provided three times per day for two weeks,[4] and another trial using single doses of up to 150 mg/kg of body weight (around 10,000 mg for a 68 kg/150 lb individual), both with no adverse effects.[5]
What are L-tyrosine’s main benefits?
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•Last Updated: May 16, 2025
L-Tyrosine primarily benefits cognitive function by replenishing catecholamine levels in the brain during stressful conditions, which helps to prevent cognitive decline and alleviate memory reduction under acute stress. It is considered safe and well tolerated at moderate doses, and studies have shown no adverse effects.