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Fatigue and Stress (Acute) Overview:
This list is for supplements that cater towards helping with acute stress and fatigue, or instances where somebody expects to experience a significant and quick dose of stressful stimuli that may leave them exhausted and defeated.The supplements in this list are a different approach from supplements that cater towards chronic stress; if in doubt as to which stress applies but you feel stressed daily then consider the supplements in the chronic stress list rather than the ones in this list.
2g tends to be the lowest recommended dose for L-Tyrosine, with many studies using this amino acid actually using doses in the 10-12g range but multiple doses throughout the 'stressful' period.
Tyrosine is the precursor to catecholamines (adrenaline, noradrenaline, dopamine) and while it isn't really capable of spiking them to higher than normal levels, having a pool of tyrosine in your body can prevent their depletion that occurs during stress.
Only for the fatigue associated with acute bronchitis (and possibly other viral infections, which are less studied), this herb can greatly reduce the fatigue associated with sickness.
900mg daily (in three doses of 300mg) is the dose of the basic root extract that is able to reduce acute fatigue. This dose correlates to 30 drops thrice daily of a tincture (1:8-10 concentration of an 11% ethanolic extract), which is the patented EPs7630 extract.