Evidence supporting the use of: L-tyrosine
For the health condition: Athletic and Exercise Aids

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Synopsis

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

L-tyrosine is an amino acid that serves as a precursor to important neurotransmitters such as dopamine, norepinephrine, and epinephrine. Its use as an athletic and exercise aid is primarily based on its role in supporting cognitive function and stress response during physically demanding activities. Scientific research has explored whether L-tyrosine supplementation can improve exercise performance, especially under conditions of stress (such as heat or prolonged exercise), by mitigating declines in cognitive performance and reducing perceived exertion.

A number of studies have investigated L-tyrosine's effects on mental performance and stress resilience rather than direct enhancements in physical strength or endurance. Some evidence suggests that L-tyrosine may help maintain cognitive function and mood in athletes exposed to acute stressors, such as military personnel or endurance athletes training in hot environments. For example, supplementation has been shown to attenuate decrements in cognitive performance during prolonged exercise or exposure to extreme conditions. However, the direct impact of L-tyrosine on physical athletic performance (e.g., strength, speed, endurance) in healthy individuals is not well supported.

Overall, the use of L-tyrosine as an exercise aid is scientifically plausible for supporting cognitive resilience under stress, but its effects on physical athletic performance are less clear and not strongly supported by robust clinical evidence. Thus, its evidence rating for use as an athletic and exercise aid is moderate, meriting a 2 out of 5.

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l-arginine
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