ZMA & Zinc
ZMA is a synergistic blend of two minerals, zinc and magnesium, and a vitamin, Vitamin B-6 or pyridoxine. All three of these compounds are extremely important in biological processes. It has also been shown that increased exercise can lead to losses of vitamins and minerals. Zinc is particularly important from a bodybuilding standpoint due to its role in testosterone production. The old story about oysters being an aphrodisiac is probably related to the fact that they are high in zinc. Low levels of zinc and magnesium have a strong adverse effect on muscle growth . So, it's obvious that people need these minerals and vitamins. What makes ZMA different is the form of the zinc, and the ratio in which it is combined with magnesium and pyridoxine.