Evidence supporting the use of: Theanine
For the body system: Dopamine

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

L-Theanine is an amino acid found primarily in tea leaves, particularly green tea. There is some scientific evidence suggesting it may influence the dopamine system in the brain. Preclinical studies in animals have shown that L-theanine can increase levels of dopamine, as well as serotonin and GABA, in certain brain regions. For example, research published in "Phytotherapy Research" and "Neurochemical Research" indicates that oral L-theanine administration can elevate dopamine concentrations, possibly contributing to its observed anti-stress and anxiolytic effects.

In humans, most studies have focused on L-theanine’s promotion of relaxation, improvement in cognitive function, and reduction in stress, often in combination with caffeine. A few small human studies suggest L-theanine may impact neurotransmitter activity, but direct evidence for a robust, clinically significant effect on the dopamine system is limited. Currently, the scientific support is preliminary, with most data coming from animal models and in vitro studies rather than large-scale human clinical trials.

In conclusion, L-theanine is used with some scientific rationale to support dopaminergic activity, but the quality and quantity of human evidence is not strong. Therefore, it receives a moderate-low rating for evidence supporting its specific use for the dopamine system.

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Products containing Theanine

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