Calcium competes for absorption with iron, zinc and copper, which are generally taken in much smaller amounts. The calcium wins out in the absorption race simply because of the much larger amounts used. So, take calcium supplements separately from multivitamins that include iron, zinc or copper, as well as separately from individual supplements of iron, zinc and copper.
Using whey protein would definitely start to fire up the digestive process. We know that a meal will kick on the digestive process. We also know that having food present lessens the potential for an upset stomach; it is unclear if protein will sufficiently do that or not – protein will dilute the contents in the stomach some – so that may reduce potential for stomach distress. But overall, a healthy meal would always be the first choice and if there has to be a 2nd choice then you could probably get away with whey protein drink.
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