Cai X, Cai J, Fang L, Xu S, Zhu H, Wu S, Chen Y, Fang S
The direct relationship between tryptophan levels and depressive symptoms and fatigue has been demonstrated by Trp depletion experiments, as reviewed elsewhere [76], and is also of interest in the context of long-term COVID, as recent studies have shown a significant decrease in plasma Trp levels in PASC patients [48], and alterations in kynurenine pathway metabolites have been associated with cognitive impairment in long COVID patients [27], as well as with anxiety and depressive symptoms in COVID-19 survivors 6 months post-infection [66]
These tablets contain 3 additives , microcrystalline cellulose, tricalcium phosphate and magnesium stearate, and are considered acceptable with low toxicity
That starts with the basics of who these drugs are designed for