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Extremely high plasma glycine concentrations may lead to hyperglycinemia and, via catabolism, hyperammonemia, potentially causing neurological symptoms such as headache or confusion-though such events are exceedingly rare outside massive irrigant absorption

For example, TB-500 was found to accelerate dormant tumor growth and disrupt the immune response in animal experiments

(2) NNMT catalyzes the N-methylation of nicotinamide using SAM as a methyl donor, consuming both substrates in the process

Other issues, like atrophic gastritis (a thinning of the stomach lining), reduce the production of stomach acid, which is essential for releasing B12 from food