is glutathione an amino acid the Master Antioxidant: What Injections Can Do for Your Body Glutathione - American Chemical Society

For instance, increasing plasma glycine through injections may transiently augment inhibitory neurotransmission (potentially producing a mild sedative or muscle-relaxant effect) and support anabolic processes such as collagen deposition or antioxidant synthesis

Potential Secondary Benefits Pain management: Early studies suggest DSIP might have analgesic properties, possibly reducing pain perception

A 2 mg dose is 0.2 mL, which equals 20 units on a U-100 syringe

2007, Bansal et al

If you're unfamiliar with the basics, start with what is bacteriostatic water

There are no reports for an LD50 for GHK without copper, so it must be very nontoxic