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Norepinephrine, for instance, plays an essential role in attention, stress reactions, and other cognitive functions.66 With that in mind, some research suggests that higher tyrosine intake translates to better resilience in stressful or cognitively demanding situations, better short-term memory, and improved cognitive flexibility.11 However, theres a good chance that tyrosines effects will be less palpable if you have normal levels of dopamine and norepinephrine when youre taking it.12 Caffeine You might find you dont function the same without your morning cup of coffee

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Zemek F, Drtinova L, Nepovimova E, Sepsova V, Korabecny J, Klimes J, et al

This effect was reportedly greater than the results observed when either GHK-Cu or HA was studied independently

doi: 10.1016/j.cmet.2012.04.003 74 PriyadarsiniK