Originally Posted by KC Fish
Might be. Might not be.... OK, but that's not really conclusive is it?
And you are confusing the direction of correlation in the second study. It's saying that normal testosterone is associated with higher Zinc levels. Which is true. The title of the link you posted reads: "Tip 151: Take Zinc and Increase Testosterone Levels..." But that's not what the second study shows at all. The study researched how testosterone levels affected Cu and Zn levels, not how Zn and Cu levels affect testosterone. The difference and direction is important. And besides that, testing Cu and Zn levels in the hair of testosterone deficient old Koreans isn't exactly the best test base for what we're talking about here.
And my original point I believe, was that if you were low in zinc you could also be low in test, or vice versa. Not that zinc would make you a superman in terms of test levels. But healthy levels of test are in fact related to zinc levels.