Cal-Mag Powder Supplements Exploring the Benefits of Cal-Mag Powder Supplements Calcium and magnesium are essential minerals that are dependent on one another for absorption and excretion. Indeed, magnesium is required for the transport of Calcium (and potassium) ions across cell membranes. Independently, calcium is well known for its critical role in bone formation and maintenance throughout life. https://www.nationalnutrition.ca/calcium-magnesium/cal-mag-powder.html #calciummagnesiumpowder