EZium Metabolic is a daily magnesium supplement with added chromium. Elevated levels of insulin and glucose are typically associated with Equine Metabolic Syndrome (typified by obesity, insulin resistance, laminitis). When under stress, horses release the stress hormone cortisol. The form of chromium in EZium Metabolic has been proven to reduce not only insulin and glucose but also cortisol levels in the blood. Feeding EZium Metabolic daily reduces the negative health impacts associated with magnesium and chromium deficiency in obese, laminitic, insulin-resistant, and horses under extreme stress. +-Note from the manufacturer: Due to recent shortages in plastic packaging the lids provided on the current 2-month pails are very difficult to open. Once the pull/tear tab is removed you need to use a hammer, a strong set of pliers, or claws to grasp the 4 tabs holding the lid in order to loosen/remove the lid from the pail.