Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Tyrosine is an amino acid that serves as a precursor to catecholamines, including dopamine, norepinephrine, and epinephrine—neurotransmitters that play crucial roles in the sympathetic nervous system (SNS). The SNS is responsible for the body's "fight or flight" response, and its activation increases the production and release of these neurotransmitters. Several scientific studies have investigated tyrosine supplementation, especially in situations associated with acute stress, cold exposure, sleep deprivation, or high cognitive demand. Some research suggests that tyrosine can help maintain cognitive performance and mood under such stressors, likely due to its role in replenishing catecholamine levels that may be depleted during sympathetic activation. For example, a review in the journal Military Medicine (2007) concluded that tyrosine supplementation could mitigate stress-induced performance decrements in military personnel. However, not all studies have found consistent benefits, and effects seem context-dependent (e.g., only under stress, not in baseline conditions). Overall, there is moderate scientific evidence supporting tyrosine's role in supporting the SNS, primarily through its contribution to neurotransmitter synthesis during acute stress, justifying a rating of 3 out of 5.

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