Reverse osmosis water can potentially remove magnesium and calcium from water, and if using RO filters, it's important to ensure adequate magnesium concentrations are still present.

“Although there's some evidence that reverse osmosis water can deprive water of some of the magnesium and calcium. So if you are going to use reverse osmosis filters and drink reverse osmosis water, you want to make sure that you're still getting the magnesium concentrations present in that water that we talked about earlier.”