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Tryptophan is a precursor for the synthesis of another neurotransmitter, serotonin, as well as melatonin (a neurohormone), niacin (a vitamin), the neuroprotectant kynurenine, and NAD + and NADP + (enzyme cofactors) (143), most of which are affected in neurodegenerative diseases
The two most common for injections are methylcobalamin and cyanocobalamin
As a potent inducer of HSF activation, AA upregulates HSF activity and subsequently induces HSP accumulation, ultimately enhancing cellular thermotolerance (Jurivich et al., 1994
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