One study measuring levels of glutathione in 30 healthy people and 30 people with insomnia found that glutathione peroxidase was significantly lower in people with insomnia (13)
It's a relatively high amount for a supplement to have, but it shouldn't be a problem for most people since the maximum per-day allowance for adults is 400mcg.34 That said, you may want to avoid Doctor's Best Glutathione + Milk Thistle if you take another supplement that includes selenium or eat a lot of selenium-rich foods (e.g., Brazil nuts, tuna)
A pharmacy might produce one batch with acceptable purity, then source raw materials from a different supplier for the next batch, resulting in a different contamination profile
These secondary indications sometimes face less prior authorization friction than the primary weight-loss indication
The Bigger Picture So, why are GLP-1 medications so expensive
Real medical providers share certain characteristics that separate them from prescription mills and outright scams