These metabolic pathways can really be something. Pathways by their nature can be kind of all-encompassing. We could think of the bigger ones like major rivers that send out tributaries that affect multiple systems. Tryptophan and the kynurenine pathways are one of those. In fact, tryptophan is such a potentially … Continue reading Could the Kynurenine Pathway Be Causing ME/CFS, FM and Long COVID?