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The material is in fact appreciated for its biocompatibility, easily tunable mechanical properties, controllable degree of crosslinking, flexibility and low cost (Cattelan et al., 2020)

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

10.1016/j.jaip.2016.04.015 23 ChotirmallS

When outdoors, wear protective clothing whenever possible, seek shade, and avoid prolonged sun exposure