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Numerous studies have shown that taking caffeine before exercise can significantly improve overall performance, largely by reducing the rate of perceived exertion [23]

Tyrosine hydroxylase-immunoreactive intrinsic neurons in the Auerbach's and Meissner's plexuses of humans

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The reduced enzymatic activity increases cellular concentrations of both substrates that NNMT would otherwise consume: S-adenosyl-L-methionine (the universal cellular methyl donor) and nicotinamide (the NAD + salvage precursor)