Since ZMA is not a patented formula, other manufacturers can produce supplements using the original ZMA formula. However, as ZMA is a registered trademark of SNAC Nutrition (SNAC Systems Inc.), other manufacturers can only brand a product as ZMA, or use the term in marketing, when they have been licensed to do so by SNAC Nutrition. A number of manufacturers take the original ZMA formula and seek to enhance it with added ingredients. SNAC Nutrition itself has ZMA-5 (ZMA formula with 5-Hydroxytryptophan ) marketed as a sleep enhancer and ZMA Nightcap (ZMA-based proprietary blend with 5-hydroxytryptophan) marketed as an anabolic mineral support. However it causes vivid dreams in subset of people.
In addition to the improvements in their anabolic hormone levels, the ZMA-supplemented athletes made significantly greater gains in strength and power, and achieved better sleep quality , than a placebo group. Better sleep quality also helps to aid muscle recovery from tough workouts. These benefits occurred in the ZMA group despite the fact that the analyses of their diets found that the athletes were all consuming well over the recommended intake for zinc. In addition to the study performed by the Western Washington University researcher, several other studies have also found that zinc and magnesium offer potent anabolic properties.*