Right Now® Mineral Gold Magnum – A high magnesium formula to help prevent grass tetany. Magnesium deficiency-and the grass tetany that can result-are dangers for lactating cows grazing lush pasture, cattle on wheat, oat, or ryegrass pasture, or any herds exposed to forage heavily fertilized with nitrogen. The Gold formula contains magnesium and calcium to help combat grass tetany and updated trace minerals to support improved reproduction and breeding rates.