I’ve always thought that the differences in effect of red K and green K could be attributed to red K being a weaker version of the element. Red K messes up Superman’s powers but we don’t ever see him becoming sick from exposure. Green K messes up his powers but because exposure also makes him sick and takes the powers away, the red K effects are never seen.
If that were the case, sufficient red K exposure could take his powers away without making him sick.
