MagSRT® by Jigsaw Health is America’s #1 Time Release Magnesium® with thousands of 5-star reviews, and clinically shown to increase Magnesium in the body.* 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.*