Magnesium is an important nutrient absorbed from breast milk that is necessary for many bodily functions. It plays a role in muscle relaxation, energy production, blood sugar regulation, and building strong bones and teeth. However, most Americans do not get enough magnesium in their diets. This is especially important for breastfeeding mothers, as they need 20% more magnesium daily than average. Without sufficient magnesium supplementation, breastfeeding mothers consuming under 2,200 calories daily are unlikely to meet their magnesium needs. Supplementing with 600mg of magnesium such as magnesium chloride can help support breastfeeding mothers' magnesium levels.