Glutathione is generally well-tolerated but can cause mild gastrointestinal side effects and, possibly, skin flushing
It might be the dose, the titration speed, a concurrent medication, an underlying condition, or a shift to a different GLP-1 medication entirely (tirzepatide, for instance, shows stronger average weight loss in head-to-head comparisons)
additional controlled studies are warranted to define safety, dosing, and efficacy parameters in new contexts.
The key difference is the receptor model
Clean the injection site with an alcohol swab and let it dry completely
MC4R activation suppresses appetite (the mechanism behind setmelanotide, an FDA-approved MC4R agonist for obesity), but also triggers nausea, facial flushing, and spontaneous erections in males at doses above 0.5mg in nave users