2018 pilot study liposomal glutathione 12 healthy adults – Mark Hyman, MD How to Increase Glutathione Naturally:

Mechanistic research focuses on nitric oxide signaling, vascular homeostasis, cellular-membrane stability, and tissue responses to chemically induced injury

it is naturally occurring, nontoxic, and is active at a very low nanomolar concentration.11 Another piece of research described GHK-Cu as a safe, inexpensive, extensively studied compound.3 These conclusions primarily apply to topical GHK-Cu, but even with injectables, the lack of serious adverse events in animal subjects points to a general tolerability regardless of the route of administration

Who manufactured it, and under what quality system

Lets start simple

Trichloroethylene: Parkinsonism and complex 1 mitochondrial neurotoxicity

Glutathione: Overview of its protective roles, measurement, and biosynthesis