We're largely on our own with this. There's this frequent argument that we should take breaks, but it seems to be based more on speculation and caution than anything concrete. Assuming copper intake is reasonable, my hope is that as with testosterone, the short half-life and pulsatile delivery of modest amounts will yield benefits with minimal disruption of the endogenous systems.
For what it's worth, I've been injecting 1 mg six times a day for several years. Regarding possible correlations, I perceive improvements in skin quality and the disappearance of some presumably benign subcutaneous growths. Last week I was mistaken for being in my 40s, 20 years younger than reality. Of course this could be many other things: genes, healthy lifestyle, other interventions, who knows. In any case, so far there are no obvious negatives. But we shouldn't kid ourselves: we are being lab rats.