MagSRT® from Jigsaw Health is America’s #1 time-release magnesium supplement.  Available in the original MagSRT® formula, or without B-Vitamins as MagSRT (B-FREE).  Boost energy, improve sleep, and relieve leg cramps with the only time release magnesium supplement that has a placebo-controlled human clinical trial with the results published in the peer-reviewed Journal of American College of Nutrition.