I can only give my experience. Hydraplenish has both HA and Collagen. You need to take vit-c with collagen, or atleast that is what I heard, so I do. I have never heard to avoid vit-c with HA.
When I take hydraplenish, my skin can go from looking like a lizard, to smooth and hydrated, without lotion, in a matter of days. Then when I used lotion, it's an added bonus. I'm talking legs and arms, as I do use a cream on face daily. The difference in my face is a fullness, or plumpness, which is caused most likely from the HA rather than a collagen supplement. But I have read accounts where women who had HA injections, had newly formed collagen in those areas, which is promising. I remember thinking when I read that, that soon HA will not be avail for injection, due to the fact that it might eliminate the need for future injections.
It's just one of those things you have to try and see if the effect is the same. I think I might try your copper though, can't hurt. Your testimony means more than a random one on a skin website :)