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Intestinal dysbiosis, by increasing inflammation, can alter the tryptophan pathway with increased indoleamine 2,3-dioxygenase (IDO) activity that reduces the tryptophan metabolism to serotonin and increases the kinurenine pathway with overproduction of quinolinic acid (QA), which has inflammatory effects in the brain [105]

GLP-1 medicines like semaglutide and tirzepatide rarely list hair loss as a side effect

The study, published in Nature , shows that tumors can break down glutathione to support their growth, challenging long-held assumptions about its role in human health

They can also: (i) improve the composition of gut microbiota

By nuking these free radicals, vitamin C tries to stop the damage from happening in the first place