Magnesium and calcium
When these minerals are taken at the same time, they may not be quite as effective, says Tod Cooperman, MD, president of consumerlab.com, an independent testing company focused on health and nutrition products in White Plains, New York. “Taking large amounts of minerals with other minerals will reduce absorption,” he says. In essence, the minerals compete with one another and both lose out. Maximize your benefits by taking any mineral supplements at least two hours apart. This is one of the six things you should know before you begin taking magnesium supplements.
Zinc and copper
Among zinc’s many benefits, enhanced immunity ranks high. You might turn to the mineral for help in staving off or shortening the duration of common colds, but you should know that zinc interferes with copper absorption. Some people need to take copper due to conditions that cause copper deficiency. If you must take copper and also take zinc, space the two out by at least two hours, Dr. Cooperman says. High doses of zinc taken over the long term (50 mg or more per day for 10 weeks or longer) can also cause copper deficiency. “This is something you can talk to your doctor about,” he says. Don’t miss these signs you’re not getting enough zinc.