I was reading BB.com and came across this from Big Cat:
ZMA worth it? - Bodybuilding.com Forums
Actually zinc is the closest to a natural miracle supplement you'll find. Provided you take enough. Load for a week with 90 mg , then drop to 45 mg. (continuing at 90 is actually fine, but until they update the RDA's and toxicity lines to reflect modern science, I'm technically not allowed to recommend that) You'll be amazed at the results if you haven't been taking any extra zinc up to this point. Its cheap and its effective. It seems to have some minor effects on testosterone, but that's not really where the effect comes from. Its mostly the influence of extra zinc in muscle tissue that locally modulates IGF actions. It so strong in fact that several zinc formulations are often applied, orally or topically, for wound healing. -The extra magnesium helps the uptake of zinc into cells, but you'll get the effect with a cheaper zinc supplement as well.
I think I'm going to try the 100mg then scale back to 50mg and see what happens.