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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

The optimal frequency, duration, and total number of courses for humans is entirely unknown

May provide targeted repair and inflammation support

It is commonly discussed as an add-on to TRT for men who want to protect fertility or reduce testicular shrinkage