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The endogenous-acetylcholine-induced VEGF expression in neurons and astrocytes [302], the VEGF signaling system is in the rescuing effect of acetylcholine on NMDA-induced long-lasting hippocampal cell damage [303]

NAD+ levels naturally decline by up to 50% between the ages of 40 and 60, contributing to fatigue, brain fog, slower recovery, reduced metabolism, and accelerated aging at the cellular level

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Several of the changes observed in connective tissue are thought to reflect variations in the levels of MMPs, the enzymes involved in regulating and maintaining the extracellular matrix that degrade extracellular matrix molecules, proteoglycans, elastin, and different types of collagens [109]