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
Nomoto T, Iizaka S
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J Cancer 15:37383749 Xu Z, Jiang W, Huang W, Lin Y, Chan FKL, Ng SC (2022) Gut microbiota in patients with obesity and metabolic disordersa systematic review
Reduced GABAergic Action in the Autistic Brain