glutathione is what for the skin Glutathione Infusions: The Key to

Selective impairment of this carrier-mediated transport can contribute to selective vulnerability of tissues to specific toxins: for example, chronically ethanol-fed hepatocytes become selectively depleted of mitochondrial glutathione because of defective carrier-mediated transport, which makes the hepatocytes susceptible to damage by reactive oxygen species generated from the oxidative metabolism of ethanol (22)

Over the following days and weeks they lay down fresh collagen and elastin, and the skin remodels

NAD+ works deeper by feeding DNA repair, mitochondrial function, and longevity proteins, which supports longterm healthspan more than quick cosmetic changes

Rigorous clinical trials of injected GHK-Cu are scarce

If you accidentally leave reconstituted HCG at room temperature for several hours, it's likely still usable